CSRF (Cross-Site Request Forgery) is an attack that impersonates a trusted user and sends a website unwanted commands. This can be done, for example, by including malicious parameters in a URL behind a link that purports to go somewhere else:

<img src="https://www.example.com/index.php?action=delete&id=123">

For users who have some permissions on https://www.example.com, the <img> element will execute action on https://www.example.com without their noticed, even if the element is not at https://www.example.com.

There are many ways to prevent CSRF, such as implement RESTful API, add secure token, etc.

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General knowledge