EPL is a functional programming language created by Microsoft Research in the early 1990s. It is based on the programming language Pascal, but extends it with features such as higher-order functions, algebraic data types, and lazy evaluation.
EPL was designed to be used in Microsoft Excel, and its syntax is similar to that of Excel formulas. It is a declarative language, meaning that programs are written as a set of declarations, rather than a set of instructions. This makes EPL programs more readable and easier to understand.
EPL has been used to create a number of applications, including a statistical analysis tool and a financial planning system. It is also used in research projects at Microsoft Research.