A blog is a regularly updated website or web page that presents information in reverse chronological order. It consists of discrete, often informal diary-style text entries called posts. Posts are typically displayed in reverse chronological order so that the most recent post appears first, at the top. In the early stages, a blog was a personal web log or journal in which someone could share information or their opinion on a variety of topics. Nowadays, blogs are used for personal use or to fulfill a business need.

Blogging is the act of creating or maintaining a blog. It is a way of expressing thoughts and opinions, while businesses can create a blog to educate their target audience. Blogging can be seen as a form of social networking service, as bloggers not only produce content to post on their blogs but also often build social relations with their readers and other bloggers. Blogging is still important today as it helps drive traffic to websites, enables better conversion of traffic into leads, and allows for engagement with an audience.