fwrite
fwrite is a standard C library function used for writing binary data to a file stream. It writes a specified number of elements, each of a given size, from a buffer to the output stream, returning the number of elements successfully written. It is part of the stdio.h header and is commonly employed for efficient file I/O operations in C and C++ programming.
Developers should use fwrite when they need to write structured binary data, such as arrays, structs, or custom data types, to files in C or C++ applications, as it offers precise control over data size and avoids text formatting overhead. It is essential for tasks like saving game states, logging sensor data, or serializing objects to disk, where performance and data integrity are critical compared to text-based alternatives like fprintf.