File Input refers to the process of reading data from a file stored on a computer or other device. This data can be in various formats, such as text, images, or spreadsheets. Programs use file input to access and manipulate this information, allowing users to work with existing data rather than creating it from scratch. In programming, file input is often achieved through specific functions or methods that open a file, read its contents, and then process that data. This is essential for tasks like data analysis, reporting, and application development, where pre-existing information is frequently utilized.