PL/B (Programming Language for Business) is a high-level programming language that was originally developed in the 1960s. It is designed for business applications and is used by many large organizations, including IBM, Honeywell, and the US Department of Defense. PL/B is a structured language that uses English keywords and syntax, making it easy to read and write. It also has a rich set of features, including support for databases, networking, and graphics.