In computer programming, code is a set of instructions that tell a machine what to do. Code can be written in any language, but it is typically written in a language that humans can understand, such as C++ or Java.

Code is used to create software, a collection of code that tells a computer how to do something. The software can be anything from a simple game to an operating system like Linux, Windows, or macOS.

Code is also used to write applications and programs that perform specific computing tasks. For example, there are apps for playing music, browsing the internet, and editing photos.