Blogs often provide commentary or news on a particular subject, such as food, politics, or local news; some function as more personal online diaries. A typical blog combines text, images, and links to other blogs, web pages, and other media related to its topic. The ability for readers to leave comments in an interactive format is an important part of most early blogs. Most blogs are primarily textual although some focus on photographs (photoblog), sketchblog, videos (vlog), or audio (podcasting), and are part of a wider network of social media.

The term "blog" is derived from "Web log." "Blog" can also be used as a verb, meaning to maintain or add content to a blog.

Types of blogs

There are various types of blogs, and each differs in the way content is delivered or written.

Media

A blog comprising videos is called a vlog, one comprising links is called a linklog,[9], a site containing a portfolio of sketches is called a sketchblog or one comprising photos is called a photoblog[10]

Device

Blogs can also be defined by which type of device is used to compose it. A blog written by a mobile device like a mobile phone or PDA is called a moblog.[11]

Genre

Some blogs focus on a particular subject, such as political blogs, travel blogs, fashion blogs, project blogs or legal blogs (often referred to as a blawgs).

Legal status of publishers

A blog can be private, as in most cases, or it can be for business purposes. Blogs, either used internally to enhance the communication and culture in a corporation or externally for marketing, branding or PR purposes are called corporate blogs.

Blog search engines

Several blog search engines are used to search blog contents (also known as the blogosphere), such as blogdigger, Feedster, and Technorati. Technorati provides current information on both popular searches and tags used to categorize blog postings.

Reference: Wikipedia
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