What is EDI? A Beginner's Guide to Electronic Data Interchange

If you've ever ordered something online, received a shipment at a warehouse, or paid an invoice — chances are EDI was working behind the scenes to make it happen. But what exactly is EDI, and why does it matter?

EDI in Plain English

Electronic Data Interchange (EDI) is a standardised way for businesses to exchange documents electronically. Instead of sending paper invoices, purchase orders, or shipping notices through the mail (or even as email attachments), EDI lets computer systems talk directly to each other using a shared language.

Think of it like this: when you send a text message, your phone doesn't care whether the other person uses an iPhone or Android — the message just works. EDI does the same thing for business documents. Whether you're a small supplier or a global retailer, EDI ensures that an invoice from your system can be understood perfectly by your trading partner's system.

How Does EDI Work?

At its core, EDI follows a simple process:

1. Create — Your business system (ERP, accounting software, etc.) generates a document like a purchase order.
2. Translate — EDI software converts that document from your internal format into a standardised EDI format (like EDIFACT or X12).
3. Transmit — The EDI message is sent to your trading partner through a secure connection (AS2, SFTP, or a VAN).
4. Receive & Translate — Your partner's system receives the message and translates it back into their internal format.
5. Acknowledge — An acknowledgment message (CONTRL) is sent back to confirm receipt.

The entire process can happen in seconds — no human intervention required.

What Types of Documents Can You Send?

Almost any business document can be exchanged via EDI. The most common ones include:

• Purchase Orders (ORDERS) — "I'd like to buy 500 units of product X"
• Invoices (INVOIC) — "Here's the bill for those 500 units"
• Despatch Advice (DESADV) — "Your shipment is on the way"
• Order Response (ORDRSP) — "We confirm your order"
• Remittance Advice (REMADV) — "Payment has been sent"

There are hundreds of message types covering everything from customs declarations to healthcare claims.

Why Do Businesses Use EDI?

EDI has been around since the 1960s, and it's still going strong for very good reasons:

• Speed — Documents that used to take days by mail now arrive in seconds.
• Accuracy — No more manual data entry errors. When a machine creates and reads the data, typos disappear.
• Cost savings — Less paper, fewer staff hours, faster payment cycles. Studies show EDI can reduce transaction costs by up to 35%.
• Compliance — Many large retailers and governments require EDI. If you want to do business with Walmart, Amazon, or the NHS, you need EDI.
• Visibility — Real-time tracking of orders, shipments, and payments improves your supply chain management.

EDI Standards: The Shared Language

For two systems to understand each other, they need to speak the same dialect. The two most widely used EDI standards are:

• UN/EDIFACT — The international standard, used in Europe, Asia, and most of the world.
• ANSI X12 — The North American standard, dominant in the US and Canada.

Both achieve the same goal but use different syntax and terminology. There are also newer approaches using XML and JSON that are gaining traction, especially for API-based integrations.

Getting Started with EDI

If your business is considering EDI, here's a practical starting path:

1. Identify your trading partners — Find out what standards and protocols they support.
2. Choose your approach — You can build in-house, use an EDI service provider, or go through a VAN (Value Added Network).
3. Map your documents — EDI mapping connects your internal data fields to the standard format.
4. Test thoroughly — EDI testing ensures your messages are formatted correctly before going live.
5. Go live — Start exchanging real documents and monitor for errors.

Is EDI Still Relevant?

Absolutely. While APIs and cloud-based platforms are growing, EDI still handles over 75% of all B2B transactions globally. It's not going away — it's evolving. Modern EDI solutions combine traditional standards with web services, giving businesses the best of both worlds.

Whether you're a retailer connecting with suppliers, a logistics company managing shipments, or a healthcare provider processing claims — EDI is the backbone of your digital supply chain.

Next Steps

Ready to dive deeper? Check out our guides on EDI Standards, explore the most common Message Types, or read our next post: EDIFACT vs X12: Which Standard Should You Use?