An interpreter is a type of computer program that translates high-level programming languages into machine code, allowing computers to execute instructions written by programmers. Unlike compilers, which translate the entire code at once, interpreters process code line by line, executing each instruction immediately. This makes them useful for scripting languages like Python and JavaScript, where quick testing and debugging are essential. Interpreters can also refer to individuals who translate spoken language in real-time, facilitating communication between people who speak different languages. These interpreters play a crucial role in various settings, such as international conferences, legal proceedings, and medical appointments, ensuring that language barriers do not hinder understanding.