Sort:  

MyEtherWallet is a wallet that holds all ETH and tokens based on ETH smart contract. EOS, TRON, OMG are popular tokens built in ETH Platform. Most of the tokens are these days built in ETH platform and MyEtherWallet can hold all those token. These token have their own name. Also, NEO, Omni are other platform to build tokens like Ethereum. I hope I cleared your confusion.

I hope you signed up for some of the airdrops. They are free money if the projects perform well. Also, you can earn more by referring more friends.