What Does Hit Mean?
A hit, in the context of Web servers, is a particular page request command that seeks access to a record on a Web server. Hits are a method of monitoring the traffic on a specific website. The more hits (or requests), the more traffic is thought to be visiting the page. This method of measuring traffic on a website can be useful as well as misleading in some cases.
Techopedia Explains Hit
Advertising agencies often maximize their hit count by putting up GIF-type graffiti which sends hundreds of thousands of hits at the same time, hence creating a false impression of high traffic.