According to Wikipedia, Video blogging, sometimes shortened to vlogging (pronounced v'LOG-ing) or vidblogging is a form of blogging for which the medium is video, and is a form of Internet television. Entries often combine embedded video or a video link with supporting text, images, and other metadata. Entries can be recorded in one take or cut into multiple parts. It is also a very popular category on YouTube.
Why go to the bother of creating video? Can't one just blog through word press and blogger traditional posting methods? Sure, but you're blogging for two reasons: 1)To share your ideas and thoughts about an interest or an industry and 2)For people to find those thoughts, read and enjoy or learn from them.
It's like the tree falling in the forest. Will anyone hear it if it's surrounded by thousands of other trees.
Video blogging commits what you're saying to video. It's very effective for a couple of reasons. First of all, in the "visual generation" people are more likely to click on a video that will guide them through the thought process or the how to process. And secondly, video is up to 7 times more likely to be seen and boost your organic results. And in the United States a recent survey revealed 25% of Americans watched a short form video communication in the last month.
If the video is targeted and focused the results will bear fruit.