What is a trigger in MySQL?

A trigger is a set of codes that executes in response to some events.

A trigger in MySQL is a set of SQL statements that automatically “fires” or executes when a specific event occurs on a table, such as INSERT, UPDATE, or DELETE operations. Triggers are commonly used to enforce data integrity rules, audit changes to the database, or automate tasks based on certain conditions. They are defined to run either before or after the event that triggers them, allowing for a high level of customization and control over database operations.