EtherDelta is a somewhat different cryptocurrency exchange platform than what you are used to seeing. It is included in decentralized exchanges (DEX). It is a platform that does not depend on a central management system for user operations or available markets. Thus, it becomes a free platform, specialized in the exchange of Ethereum and some ETH-based tokens.
EtherDelta could be considered the ideal option for those who have acquired an ERC-20 token during an ICO offer, since it usually takes a reasonable time until it is token or cryptocurrency start adding on popular platforms. In this exchange you can find a large amount of token and do tranding. EtherDelta uses smart contracts to manage users' private keys and carry out transactions in a secure environment and under a P2P modality.