The document discusses compilers and interpreters. It defines a compiler as a piece of code that translates high-level language code into machine language. An interpreter converts high-level code into an intermediate form before executing it on a statement-by-statement basis. While compilers and interpreters both convert high-level code, compilers generate an output program that can run independently, whereas interpreters evaluate the source program during execution without generating an output. The document provides examples of compiler and interpreter code and compares key differences between the two.