A blog (short for “Web Log” or “web diary”) is a website format or section of a website that is characterized by the regular publication of content (posts) arranged in reverse chronological order. Conceptually, a blog originated from the idea of an online diary, but in its modern form has evolved into a dynamic publishing platform that can be personal, corporate, or specialized.
The main function of a blog is to serve as a source of fresh, up-to-date, and often informal information that engages readers and maintains ongoing communication. It is a place where expertise and personal tone can combine to build an authentic voice for the creator or organization. Blogs are key to the information architecture of websites, as they provide semantically relevant content for search engines.
In the context of SEO, a well-maintained blog is a generator of long-term organic traffic, as each post represents a new front door for search engines to the main domain. It is a critical element for building E-E-A-T (Expertise, Experience, Authority, Trust) by demonstrating in-depth knowledge of the niche.