A parser is a software component that interprets and processes input data, typically in the form of text. It breaks down the data into manageable parts, allowing a computer to understand its structure and meaning. Parsers are commonly used in programming languages, where they analyze code to ensure it follows the correct syntax and semantics. In addition to programming, parsers are also essential in data processing and web development. For example, they can convert HTML documents into a format that can be easily manipulated by other software. Overall, parsers play a crucial role in enabling effective communication between humans and machines.