A function is a named series of statements. Invoking a function's name, known as a function call, causes the function's statements to execute. Python comes with a number of built-in functions, such as input(), int(), type(), and others. A programmer can also create a new function using the def keyword, the new function's name, and a block of statements. A block is a series of indented statements following the function definition. To call a function, use the function's name followed by braces function_name(). This causes execution to jump to the function's statements. The function's return causes execution to jump back to where the original call occurred, to the next statement after the call. A good practice is to follow the convention of naming functions with lowercase letters and underscores, such as print_names or print_face. Your task for this project is to create a simple ATM script. The script emphasizes the importance of using functions in the creation of a more organized and reusable code.