Uniswap maintains a suite of subgraphs for indexing and organizing data from Uniswap smart contracts. Each version of Uniswap has its own subgraph hosted on the Graph Protocol and can extract on-chain information like the current liquidity of a pool, Total Volume Locked (TVL), fee collections, swap data, and more.  The Uniswap V3 Subgraph is particularly useful for developers seeking to build applications that interact with the Uniswap V3 protocol, such as trading analytics and liquidity management tools.