This document provides an overview and summary of TiDB, an open-source distributed SQL database inspired by Google's Spanner and F1. The summary includes: 1. TiDB is a distributed SQL database that is compatible with MySQL and provides horizontal scalability, high availability, and strong consistency with a hybrid OLTP/OLAP architecture. 2. It consists of TiDB, TiKV, and PD components where TiDB is the frontend MySQL compatible database layer, TiKV is the distributed key-value storage layer, and PD is the placement driver for metadata management. 3. TiDB is being used by over 300 companies including Mobike for applications such as real-time analytics, high concurrency