Google Docs offers an autocorrect feature called Automatic substitution that can be turned on and off, and it has various uses such as fixing typos, replacing markup languages, and automating text expansion for repeated phrases or sentences. To turn on the autocorrect feature in Google Docs, click Tools > Preferences, select Automatically correct spelling and then make sure Automatic substitution is checked. You can also add custom autocorrect options to replace specific words or phrases with others. To turn off the autocorrect feature, simply uncheck Automatic substitution. The feature can be useful for personal editors, text expander users, and those who want to automate tasks in Google Docs. Google Docs' autocorrect feature is particularly useful when used in conjunction with other tools like Zapier, which allows users to connect Google Docs to thousands of other apps and automate tasks such as creating templates and populating data.