I know that the deep web mainly uses cryptos as a means of transactions for people who want to buy things over there, but what type of cryptos are mainly used when making those transactions? It’s just a curious question I have in my mind.

I recently heard of Dogecoin from a couple of friends of mine. Is it a meme or an actual cryptocurrency, because so I would like to get some myself. Also, what trading platforms trade Dogecoin?
   
Also, if possible can you mention any useful information about Dogecoin that I can use when trading it or buy it. Thanks.