As you surf the Internet with Apple's Safari browser, the URL or address of each Web page you visit is stored in Safari's history list. This makes it easy to return to any page, but it can also pose a security or privacy risk, particularly if you share a computer with others. Clearing the search history before exiting Safari prevents others from viewing your personal search history and maintains your privacy.
Clearing The Entire Search History In Safari
Open the Safari browser and click "History" from the Safari menu.
Select "Clear History" under the "History" menu.
Verify you want to clear the search history.
Click "Clear," and the history is erased.