We can say that Tellor is an Oracle developed to move both off-chain and very valuable data to Ethereum.
Most of the time, the blockchain network does not work with other applications. Tellor's goal is to find a solution to this problem. Tellor wants to give third parties a role to access and put data into chains that are not available in Ethereum. It does this by building a competitive miner network. The goal here is to access the data of smart contracts.
At this point, TRB coin comes into play. The TRB coin is the token of the Tellor platform and powers the Tellor Oracle network. Miners earn TRB coin rewards when they provide on-chain information flow to the network. Of course, miners have to deposit TRB tokens on Tellor smart contracts before they can receive rewards.
During the DeFI craze, the TRB coin, a DeFI token, became very popular. Especially being supported by platforms such as Binance, MakerDAO and ConsenSys has increased the trust in it. If it continues like this, I believe it will be a much more valuable project.