If you see a significant increase in the online traffic to your Internet site and if after you check the visitor statistics it turns out that it comes from locations all over the world or from other web servers, your website is more than likely being attacked by an automatic bot. These pieces of software go through random sites attempting to log in to their admin area using a brute-force attack or to leave spam comments underneath every article where this type of an option is made available. However, that is something quite frequent these days, but if you know the IP addresses through which the attacks come, you could block them, so the bots won't be able to access your site in any way. Of course, you'll be able to block IPs even if you allow only people from particular countries to access your website.