Compound has opened up a whole new world of functionality and liquidity. All the assets that used to stay locked away in Compound are now free to move about the ecosystem, ready to be utilized for other purposes. You can transfer, trade, or send cTokens to cold storage, just like any other token on Ethereum. In fact, you can even integrate them into other protocols. That is, any protocol where you can lock tokens could choose to accept any cToken. This would allow you to earn interest on top of the benefits the protocol already gives you. The perfect example of this new interoperability is the Uniswap Dai-to-cDai liquidity pool. Users (and smart contracts) can swap their Dai or any token for that matter into cTokens to take advantage of Compound’s interest-based exchange rate. And compared to simply holding Dai, pooling cDai earns you interest while also exposing you to trading fees on Uniswap.