In which cases is the Big-Endian byte order used when storing data?

The Big-Endian byte order is used when the most significant byte of a number is stored at the lower memory address, and the least significant byte at the higher address. This is used in network protocols (e.g., TCP/IP), where the byte order is standardized as Big-Endian (also known as network byte order). Some processors and file formats also use Big-Endian for compatibility and standardization.