Ever been in a meeting where everyone seems to be speaking a completely different language?

Someone says, "We need to QC the SKUs before we receive the LPNs into the WMS. Also, all DTC and LTL orders should allocate using FIFO." 

Everyone around the table nods confidently...

Meanwhile you're wondering if you accidentally walked into a secret society.

If that sounds familiar, you're definitely not alone.

The warehouse, logistics, and fulfillment industry is packed with acronyms and specialized terminology. Whether you're launching your first ecommerce brand, working with a 3PL, joining a warehouse team, or simply trying to understand conversations with customers and vendors, it can feel like learning a new language.

The good news? Once you know the basics, everything starts to click.

This glossary explains some of the most common warehouse, fulfillment, shipping, and ecommerce terms you'll hear throughout the industry. We've also included several newer terms that have become increasingly important as fulfillment continues to evolve through automation, AI, and omnichannel commerce.

Let's decode the language of logistics.

Warehouse & Fulfillment Systems

WMS – Warehouse Management System 

A Warehouse Management System (WMS) is the software that powers daily warehouse operations. It manages inventory, receiving, putaway, picking, packing, shipping, cycle counts, lot tracking, serial numbers, and much more.

Think of it as the brain of the warehouse. Without a WMS, many warehouses rely on spreadsheets or manual processes that increase the risk of inventory errors and shipping mistakes.

OMS – Order Management System 

An Order Management System (OMS) sits before the warehouse. It receives orders from your ecommerce store, marketplaces, or retailers, applies routing rules, and determines where each order should be fulfilled before sending it to the warehouse.

TMS – Transportation Management System

A Transportation Management System (TMS) helps manage shipping decisions. It selects carriers, applies shipping rules, compares rates, generates labels, and helps optimize transportation costs while ensuring shipments arrive on time.

ERP – Enterprise Resource Planning

An ERP connects multiple parts of a business, including accounting, purchasing, inventory, manufacturing, and sales, into one central software platform. Many ERPs integrate directly with WMS and OMS systems to streamline operations. 

API – Application Programming Interface 

An API allows different software systems to communicate with one another automatically. APIs are commonly used to connect ecommerce platforms, warehouse systems, shipping software, and inventory management tools. 

EDI – Electronic Data Interchange 

Electronic Data Interchange (EDI) is the standardized method businesses use to exchange documents like purchase orders, invoices, and shipment notifications electronically. It's commonly required when working with large retailers. 

Fulfillment Models

3PL – Third-Party Logistics 

A Third-Party Logistics (3PL) provider stores inventory and fulfills orders on behalf of another business. Instead of operating your own warehouse, you outsource storage, order fulfillment, shipping, returns, and value-added services like kitting or custom packaging. 

DC – Distribution Center 

A Distribution Center (DC) is a warehouse specifically designed to receive, store, process, and distribute products efficiently throughout the supply chain. 

FBA – Fulfilled by Amazon 

Fulfilled by Amazon (FBA) allows sellers to store products in Amazon fulfillment centers. Amazon handles picking, packing, shipping, customer service, and returns.

Amazon regularly updates inventory requirements, storage limits, and fees, making inventory planning especially important for FBA sellers.

FBM – Fulfilled by Merchant 

With Fulfilled by Merchant (FBM), products are sold on Amazon, but fulfillment is handled by the seller or a third-party fulfillment provider.

Many growing brands use FBM to maintain greater control over inventory while also expanding beyond Amazon into their own ecommerce channels.

B2B – Business to Business 

Business-to-Business (B2B) fulfillment refers to selling products to retailers, distributors, or wholesalers such as Target, Walmart, REI, or independent retailers.

Orders are typically larger and often require compliance with retailer-specific routing guides and shipping requirements.

B2C – Business to Consumer 

Business-to-Consumer (B2C) fulfillment refers to shipping products directly to individual customers through ecommerce websites, marketplaces, or social commerce platforms. 

DTS – Direct to Store

Direct-to-Store shipping delivers products directly to retail store locations instead of first sending inventory to a retailer's distribution center. 

Omnichannel Fulfillment – (This one isn't an acronym)

 Omnichannel fulfillment allows businesses to manage inventory across multiple sales channels, including ecommerce websites, Amazon, Walmart Marketplace, retail stores, and wholesale, from one centralized inventory system. 

Shipping & Transportation Terms 

SP – Small Parcel

Small Parcel shipments are individual packages that don't require palletized freight. Common carriers include UPS, FedEx, USPS, DHL, and regional parcel carriers.

Transit times generally range from one to five business days depending on destination.

LTL – Less Than Truckload 

Less Than Truckload (LTL) shipping is used for palletized freight that doesn't require an entire trailer.

LTL is typically the most cost-effective option for shipments weighing more than approximately 250 pounds but less than a full truckload.

FTL (or TL) – Full Truckload 

Full Truckload shipping uses an entire trailer dedicated to one shipment. This option is often preferred for large shipments, high-value freight, or time-sensitive deliveries. 

POD – Proof of Delivery 

 Proof of Delivery confirms that a shipment successfully reached its destination and was received by the intended recipient. 

BOL – Bill of Lading 

A Bill of Lading is the legal document that accompanies freight shipments. It outlines shipment details and serves as the chain of custody between the shipper, carrier, and receiver. 

ASN – Advance Ship Notice 

An Advance Ship Notice (ASN) is an electronic notification sent before a shipment arrives, allowing the receiving warehouse or retailer to prepare for incoming inventory. 

Inventory & Warehouse Operations 

SKU – Stock Keeping Unit 

A SKU is the unique identifier assigned to each product variation, helping warehouses accurately track inventory. 

LPN – License Plate Number 

An LPN is a unique barcode assigned to a pallet or group of inventory that allows warehouses to track inventory movements efficiently. 

SCN – Serialized Carton Number 

A Serialized Carton Number uniquely identifies an individual carton and connects it to a specific order for tracking throughout fulfillment. 

SPN – Serialized Pallet Number

A Serialized Pallet Number identifies an entire pallet and links together all cartons assigned to that shipment. 

FIFO – First In, First Out 

FIFO ensures the oldest inventory received is shipped first. This is commonly used for products with shelf life or expiration dates. 

LIFO – Last In, First Out 

LIFO prioritizes shipping the newest inventory first. While less common in fulfillment, it can be appropriate in certain inventory strategies. 

FEFO – First Expired, First Out 

FEFO prioritizes shipping inventory with the earliest expiration date first, helping reduce waste and ensure product freshness. 

Cycle Counting 

Rather than counting all inventory once a year, cycle counting involves regularly counting smaller portions of inventory throughout the year to maintain inventory accuracy. 

Slotting 

Slotting is the strategic placement of products throughout a warehouse to reduce travel time and improve picking efficiency.

Pick Path Optimization 

Pick path optimization uses software to determine the fastest route through the warehouse for order pickers, reducing fulfillment time and labor costs. 

Quality & Production 

QC – Quality Control 

Quality Control (QC) includes the inspections and procedures designed to ensure products meet quality standards before shipping. 

SPC – Statistical Process Control 

Statistical Process Control uses sampling and data analysis to monitor quality throughout production or kitting projects rather than inspecting every item. 

BOM – Bill of Materials 

A Bill of Materials lists every component and quantity required to build or assemble a finished product or kit. 

Ecommerce & Returns 

Reverse Logistics 

Reverse logistics refers to the movement of products from customers back to the warehouse for returns, repairs, refurbishment, recycling, or disposal. 

Returns Management 

Returns management is the process of receiving, inspecting, restocking, refurbishing, or disposing of returned products efficiently while protecting customer satisfaction. 

Modern Warehouse Technology 

AI – Artificial Intelligence 

Artificial Intelligence is transforming warehouse operations by improving demand forecasting, labor planning, inventory optimization, customer support, and order routing.

Rather than replacing people, AI is increasingly helping warehouse teams make faster, smarter decisions.

AMR – Autonomous Mobile Robot 

AMRs are robots that safely navigate warehouses without fixed tracks, transporting inventory between workstations to reduce employee travel time. 

Cobot – Collaborative Robot 

Collaborative robots, or cobots, are designed to work safely alongside warehouse employees by assisting with repetitive tasks like picking, packing, palletizing, and sorting. 

Inventory Visibility 

Inventory visibility is the ability to see accurate, real-time inventory levels across warehouses, fulfillment centers, retail stores, and ecommerce channels.

A Little KSP History 

KSP – Kitting Solutions Plus

As our services expanded beyond kitting to include comprehensive B2B and B2C fulfillment, ecommerce support, and warehouse solutions, we rebranded to KSP Fulfillment in 2018 to better reflect the full range of services we provide today.

While our name has evolved, our commitment to helping brands grow through reliable fulfillment has remained the same.

Ready to Put These Terms to Work? 

Now that you're more familiar with the language of logistics, you'll be better equipped to evaluate fulfillment partners, navigate shipping conversations, and make informed decisions for your business.

If you're looking for a fulfillment partner that values clear communication instead of confusing jargon, we'd love to help. Whether you're shipping direct to consumer (DTC), wholesale, or both, our team is here to make fulfillment simpler.