In database development, transactions are one of the most important concepts, especially in scenarios with high concurrency and strict data consistency requirements. As a popular relational database, MySQL provides strong support for transactions, but many developers are not familiar with its implementation principles, design logic, and precautions in daily use. This article will deeply analyze the transaction implementation mechanism of MySQL, explain the four major characteristics of transactions and the problems they solve, analyze why MySQL is designed in this way, and propose some tips for developers to use transactions in their daily lives.