EDI replaces paper, email and manual keying with structured data that one company’s system can send and another’s can read without retyping. Each business document has an agreed layout, so both sides know exactly where to find the item number, quantity, price or ship-to location. In North America most EDI follows the ANSI X12 standard; internationally, EDIFACT is common.
A typical exchange works like this: your ERP produces a document, EDI software translates it into the standard format through EDI mapping, and it travels to the trading partner over a secure connection such as AS2, SFTP or an EDI VAN. The receiving system checks the file, returns a functional acknowledgment and translates the data into its own system.
EDI matters because it removes re-keying errors and shortens the order cycle. Its limits are just as real. Each trading partner can have its own requirements, setup and testing take specialist effort, and many suppliers, customers and carriers do not run EDI at all. A file can also be technically valid and still carry the wrong quantity or price, so EDI on its own does not guarantee the business transaction is right.