101011101 Endianness is the order that the bits/bytes are in. Big endian means that the first bit is the one with the highest value (that's the way that we're counting in this thread). Little endian means that the first bit is the one with the smallest value. Basically, when a binary number is stored in little endian, then it's stored in reverse. note: Generally in programming the endianness changes the order of the bytes, not the bits. So each grouping of 8 bits is left unchanged, but the order that each group appears is reversed.