Basic Attention Token (or BAT) is an utility token and ad exchange tool associated with the Brave browser. BAT is an open-source decentralized project as it's based on the Ethereum blockchain.
The very concept of BAT is aimed at changing relations between users, advertisers, and publishers creating a separate ad space where ads can be easily switched off by users. If users opt to watch ads they get rewards from advertisers in BAT tokens. Users can donate BAT tokens to content creators or use it on the platform.
DEW (DEW) abbreviation stands for “Decentralized Exchange of the World”. Therefore, DEW token is the native token of this exchange platform. It is based on the Ethereum protocol. You can buy DEW for crypto (for example, BTC or ETC) on the number of exchanges.