Hello Jenna,
My name is Nada an independent advisor, and I'm here to help you.
The AppData keeps important information about your applications such as the Microsoft Word Dictionary and other personalized settings for applications such as Chrome or programs.
Here is how you free up clear up unwanted data:https://answers.microsoft.com/en-us/windows/for...
Source: https://answers.microsoft.com/en-us/windows/for...
Feel free to ask any further questions.