The function print() is a built-in command in many programming languages, including Python and Java. It is used to display output to the console or standard output device. When you call print(), you can pass various types of data, such as strings, numbers, or variables, and it will convert them into a human-readable format. In Python, for example, you can use print("Hello, World!"), which will display the text "Hello, World!" on the screen. The function can also take multiple arguments and can format the output using special characters, making it a versatile tool for debugging and user interaction in programming.