The difference is that the focus of the previous definition is the log, which, in essence, carries the contents of the log in the form of video, just like a text diary and a picture diary; The latter definition is to pay more attention to video, and the content of log is video service, while vlog is just one of many styles of video, with daily records as its content. For the post-95 s and even post-00 s in the world, vlog has gradually become the most important way for them to record their lives and express their personalities. This is the historical evolution of personal blog, from personal webpage to blog, from 8 mm experimental movie to Hi-8, BT sharing, Web2.0, Youtube.