TiDB is an open source distributed scalable hybrid transactional and analytical processing (HTAP) database built by PingCAP. It also speaks the MySQL protocol and uses RocksDB as the underlying storage engine! This talk provides an introduction and overview of TiDB, tailored for those with a strong background in MySQL. I will use MySQL as an example to explain various implementation details of TiDB, and translate terminology to MySQL/InnoDB terms.