From time to time you may have to block certain third parties from accessing your websites. There are a lot of automatic bots that crawl the Internet, for instance, and generate fake visits and online traffic. There are also spammers that leave links to shady Internet sites as comments to blog articles. Such things could greatly undermine your work, because no one likes to visit a site with many fake comments, plus the increased traffic from both spammers and bots can create high load on the server on which your website is hosted, which may result in your site not functioning properly. One of the best solutions in such cases is to block the IP addresses which generate the fake traffic, in order to be sure that the visits to your website are real.