If you notice a large increase in the traffic to your Internet site and in case after you examine the visitor stats it turns out that it comes from areas across the world or from other servers, your Internet site is most likely being attacked by an automatic bot. Those programs go through random sites looking to log in to their admin area by using a brute-force attack or to leave spam comments below every article where this kind of an option is made available. Unfortunately, that is something quite common these days, but if you know the IP addresses from which the attacks come, you may block them, so the bots shall not be able to access your website in any way. Naturally, you may block IPs even if you allow only people from particular countries to access your Internet site.