What's the difference between API Before-Save Script and Before-save custom script?

[crmtesting]

As far as I could understand, both are run before an entity is saved. So, are they similar or entirely different things..?

[yuri]

It's explained in docs https://docs.espocrm.com/administrat...e-save-script/

And in the UI.

[yuri]

The API script will run only when you save via the API (that includes saving from the UI). It won't run when a record is saved from workflows, other formula script, from code, etc. This provides the ability to validate a user input or perform access checks.

[crmtesting]

Thank you for you response.