ACID是事务的四个基本特性：

1、原子性（Atomicity）： 事务作为一个整体被执行，要么全部完成，要么全部不执行。

2、一致性（Consistency）： 事务必须使数据库从一个一致性状态转换到另一个一致性状态。

3、隔离性（Isolation）： 事务的执行不被其他事务干扰。

4、持久性（Durability）： 一旦事务提交，其结果就是永久性的。

这些特性确保了数据库事务的可靠性和稳定性。

ACID in MySQL refers to the four basic properties of transactions:

1. Atomicity: A transaction is performed as a whole, either completely executed or not executed at all.

2. Consistency: Transactions must transition the database from one consistent state to another consistent state.

3. Isolation: The execution of transactions is not disturbed by other transactions.

4. Durability: Once a transaction is committed, its results are permanent.

These properties ensure the reliability and stability of database transactions.