PL/I: Programming Language One
PL/I, short for Programming Language One, is a high-level, general-purpose programming language developed by IBM in the 1960s to unify scientific, engineering, and business computing. It is used primarily on IBM mainframe systems for enterprise applications that require numerical computation, data processing, and transaction handling. Developers can access PL/I through IBM mainframe toolchains and official documentation provided with z/OS and related enterprise development environments.