standard library

RU: стандартная библиотека

The collection of built-in functions, data structures, and modules that ships with a programming language and is available without installing additional packages. Examples: Python's len(), json, and os modules; JavaScript's Array.prototype.map() and Math; Java's java.util.ArrayList and java.io.File. The standard library is part of the language's runtime system — when your code calls a standard library function, the runtime supplies the implementation.