While clearing your history stops anyone else who uses your device from seeing what you do online, it won’t stop any determined attackers. After all, anyone can perform a system restore to have the logs magically reappear, or consult the DNS cache to see the domains (but not pages) that you’ve visited. Your ISP can keep its own record of your browsing history, for example, to which you have no access. There are even companies that specialize in recovering lost data who’d be happy to help.
It’s important to note that deleting your browser history does not hide your history from your Internet Service Provider, employer, college, or network administrator. Neither does a private tab -- these simply limit cookie access and delete the history when you close the browser. Instead, we recommend using a reputable no-logs Virtual Private Network in combination with an incognito or private tab when trying to protect your browsing habits hidden from prying eyes.