The term "IBM PC Compatible" refers to computers that can run software and use hardware designed for the original IBM PC, which was introduced in 1981. These compatible systems follow similar architecture and specifications, allowing them to operate the same operating systems and applications, such as MS-DOS and later Windows versions. Over time, many manufacturers produced their own versions of IBM-compatible PCs, leading to a diverse market. This compatibility helped establish a standard for personal computers, making it easier for users to find software and peripherals, such as printers and keyboards, that would work across different brands.