If you got here, you basically know what it’s about. But, just to make sure we’re talking about the same thing, let’s try a simple definition:
A blog is an internet website which respects a certain structure, defined by the reverse chronological order the content appears in on the front page.
A little complicated (and I kept it simple, believe me), but this is exactly what a blog is: a series of articles and texts about a domain of the author’s choosing, arranged in the reverse order they were entered in the database (the latest appear highest on the front page).
A blog is defined by its subject and its author. Compared with ordinary websites, the blog emphasizes the personal experiences of its author (a lawyer keeping a blog will usually write about his cases, about what he believes, usually without specific law terms).
A blog can be defined in greater detail and, furthermore, there are many different types of blogs: personal blog, business blog, photoblog etc. Later, you can read about business blogs.