What is the endianness?

Answer:

The endianness is the order of bytes to store data in memory and it also describes the order of byte transmission over a digital link. In the memory data store in which order depends on the endianness of the system, if the system is big-endian then the MSB byte store first (means at lower address) and if the system is little-endian then LSB byte store first (means at lower address).

Some examples of the little-endian and big-endian system.