It is important to understand the functionality and features of your Web browser, whether it is Internet Explorer, Mozilla Firefox, Google Chrome or Apple Safari, to name a few. Enabling some Web browser features may lower security. Often, manufacturers will enable features by default to improve the computing experience, but these features may end up increasing the risk to the computer and causing vulnerabilities.
"Broswer Cache" includes all the cookies and Web pages and other temporary Internet files automatically saved to your computer whenever you use the Internet. In theory, it's supposed to make your browsing faster to have these on hand, especially for sites that you visit often.
It is part of good computer "housekeeping" to periodically delete this cache. For instructions, visit the Clear Browser Cache page in the email website.