A Blog is a website in which journal entries are posted on a regular basis and displayed in reverse chronological order, with the most recent entry on top.

The term blog is short for weblog or web log. Individual articles on a blog are called "blog posts", "posts" or "entries". A person who posts these entries is called a blogger. A blogroll is a collection of links to other weblogs. With the advent of syndicated newsfeeds, even blogrolls can be, and are being, syndicated. OPML is one of the popular ways to syndicate a blogroll in case a weblog author wants others to be able to access the weblogs in his/her blogroll. Moblogging refers to posting blog updates from a cell phone, camera phone or pda (personal digital assistant). Mobloggers may update their web sites more frequently than other bloggers, because they don't have to be at their computers in order to post

Like other media, blogs often focus on a particular subject, such as food, politics, or local news. Some blogs function as online diaries. A typical blog combines text, images, and links to other blogs, web pages, and other media related to its topic. Since its appearance in 1995, blogging has emerged as a popular means of communication, affecting public opinion and mass media around the world.

Blogs can be hosted by dedicated blog hosting services, or they can be run using blog software on regular web hosting services.

The explosion in blogging software and services -- like Blogger, TypePad and WordPress -- has turned blogging into one of the easiest ways for people to maintain a constantly updated web presence. In addition to the classic text blog, we now have photo blogs (consisting of uploaded photos), audio blogs (a.k.a."podcasts") and video blogs (which consist of regularly uploaded video files).