endianness
The order in which a multi-byte value's bytes are stored in memory.
Endianness is the byte order of a multi-byte value in memory; little-endian stores the least significant byte at the lowest address, big-endian the most significant.
Examples
The 4-byte value
0x12345678is stored as78 56 34 12on a little-endian machine and as12 34 56 78on a big-endian one.
See also