fopen

`fopen` is a function used in programming to open a file so that the program can read from or write to it. Think of it as unlocking a physical file so you can look at or change its contents. When you use `fopen`, you specify the file's name and whether you want to view, modify, or create it. Once opened, the file handle it provides allows your program to perform operations like reading data, adding new information, or saving changes. After work is done, the file should be closed to ensure data integrity and free up system resources.