The term "endian" is based on the book Gulliver's Travels, in which the citizens of Lilliput were debating over two customs: breaking an egg either from its small (little) end or big end. Just like them, computer engineers are also divided into two groups: either those preferring to store bytes left-to-right, or those storing bytes right-to-left.
Example: the 2-byte integer $10010111\_01101011$ will be stored either as
Address | $100$ | $101$ |
---|---|---|
Content | $10010111$ | $01101011$ |
Address | $100$ | $101$ |
---|---|---|
Content | $01101011$ | $10010111$ |
if we follow the little endian principle.