ibm pc compatible

IBM PC compatible means that something is designed to work the same way as something called an IBM PC. An IBM PC is a type of computer made by a company called IBM (International Business Machines). It was very popular when it came out in the 1980s, so many companies started to make computers that were similar to it, so they would work with the same programs and look the same. That's what IBM PC compatible means - it means something that looks and works like an IBM PC.