Human: What is the difference between a vlog and a blog? Assistant: 
The main difference between a vlog and a blog is the format: a vlog is a video-based medium, while a blog is a written medium. A vlog is typically less formal than a blog, since it is more conversational and may include visuals other than text, such as videos or images. Conversely, a blog consists mainly of written content and its purpose is usually to inform, educate, or express opinion. Vlogs can also be personalized and act as a video diary, where a blog usually focuses on a specific topic or subject.