You must clear cache, history, and cookies on your Android phones or tablets to keep them running well. It is important that you regularly perform maintenance on your Android phones and tablets. Over time, as you use your browser, your Android tablet will accumulate temporary data that may slow down the tablet. When you access various websites, the browser automatically keeps history of the websites you visit. Many websites will drop cookies into your tablet to use the next time you visit the website. These cookies contain tracking information, login data, or information about what you looked at the last time you visited the website.