This document discusses the C programming language. It was invented by Ritchie in 1972 and published in 1978. C is a computer language that allows developers to create applications and games. The document provides examples of C code, including a simple "Hello World" program. It describes various C keywords, data types, and operators. It also discusses conditional statements, loops, functions, and includes an example of a simple C program that takes in two numbers, adds them together, and prints the result.