If you're completely clueless to what My Little Pony is (o_o...), I truly pity you. But, I will explain.
My Little Pony is a symbol of the 80's. There was a TV show called My Little Pony, and also a movie. Figurines of the ponies came out, and I'll be willing to bet you any female from the 80's has at least one. I was born in the late 80's and I still have a billion of them (I collect).

I'm not exactly all knowledgeable in the early 80's ponies, so I'll do myself a favor and not embarrass myself in their descriptions. I'll just give brief descriptions of the times (maybe a few pictures) and the ponies until the 1997-2003 era. Then I'll get more detailed.

Side edit:
This will take me some time to do, so please be patient. Thankies!
-Becka.