To understand the concept of endianness , you need to be familiar, at a highly abstract level, with memory. All you need to know about memory is that it's one large array. The array contains bytes. In the computer world, people use address to refer to the array locations.
Each address stores one element of the memory array. Each element is typically one byte. In some memory configurations, each address stores something besides a byte. However, those are extremely rare so, for now, let's make the broad assumption that all memory addresses store bytes. READMORE.