Difference between Apply and Alter?

[devlife]

What is the difference between ContentItemExtensions.Apply() and ContentItemExtensions.Alter()?

[hishamco]

Alter() can create or modifies the content item, while Apply() updates the content item. That's why you will find that Apply() used internally by Alter()

Seems that's why I saw Alter() has been used on almost the migrations

[devlife]

Thanks very much!!