Polkadot is being used in many projects and the market needs something like this. In near future polkadot can connect various blockchains and would help DeFi. I have written an article covering where polkadot is used, do give it a read :) Check out the article: https://hive.blog/hive-167922/@esmeesmith/what-is-polkadot-used-for https://leofinance.io/@esmeesmith/what-is-polkadot-used-for