A family of Microsoft word processing software products for creating web, email, and print documents.
In Word, AutoCorrect is a specific feature which lets you replace a specific string with other content. Word includes predefined AutoCorrect entries (by language). See https://support.microsoft.com/en-us/topic/add-or-remove-autocorrect-entries-in-word-e7433b94-f3de-4532-9dc8-b29063a96e1f.
If you are referring to some other feature, post back.