Big Endian: The most significant byte is stored at the lowest address, while the least significant byte is stored at the highest address. This order is commonly referred to as "network byte order".

Little Endian: The most significant byte is stored at the highest address, while the least significant byte is stored at the lowest address (remembered as "high-high-low-low"). This order is commonly referred to as "host byte order".

For example, the hexadecimal number 12345678，would be converted to 78563412.

The consideration of endianness is only necessary for data larger than one byte. For a single byte of data, endianness is not relevant.