Well what is it indeed They are not much different from normal BLOGS, it is much easier as videos are easier to create, if you do not want to type away at the keyboard for hours and they are always perceived as more valuable than just text. As Pictures or Video is saying more than words.
Vlogs - Video clips are short clips of video, usually part of a longer piece. The term is also more loosely used to mean any short video less than the length of a traditional television program. it is also part of video marketing wherein you can easily updates videos from your sites and send it through Social Media Networking sites.
Vlogging, short for "video blogging", is blogging through the medium of video. A blog is any web page updated on a regular basis with discrete entries, often delivered to a viewer who has subscribed to the blog and reads it using a third-party interface, or RSS aggregator, rather than visiting the website directly. An RSS aggregator allows the reader to consolidate multiple blog feeds into a single personalized web page.
Vlogging is video blogging. It helps visitors to stick to the blog easily. This is a new technique to attract customers and increase sales.