Though there are different approaches to weblogs, they can be defined as web sites where users post entries (news, articles…), updated frequently and normally reflecting the thoughts of the blog’s creator. Those entries (posts) are typically listed in reverse chronological order (the most recent entry on the top).

Most blogs allow visitors to leave their own comments on the diverse entries or even references from other blogs (trackbacks). This communication between different blogs and bloggers is one of the main factors involved in the fast growth of the so-called “blogosphere” (the whole community of blogs) and its current influence.