A frequently updating online personal journal or diary is a blog. It is a place to express yourself to the world. A place to share your thoughts and your passions.
‘A weblog is a hierarchy of text, images, media objects and data, arranged chronologically, that can view in an HTML browser.’ Source
‘A frequent, chronological publication of personal thoughts and Web links.’
‘From “Web log.” A blog is basically a journal that is available on the web. The activity of updating a blog is “blogging” and someone who keeps a blog is a “blogger.”‘ Source.