The person who makes a vlog — someone who regularly films themselves talking to camera and posts it, usually on YouTube, usually with a name and a face their viewers know. Careful here: the dictionary line you were given describes the vlog, not the vlogger. A vlog is the thing; a vlogger is the human being who makes it. For many vloggers this is a real job, paid by advertising, sponsors, and their own products, so you will hear it discussed the way you would discuss any career: "she quit teaching to be a full-time vlogger." The word suggests a particular style — personal, informal, self-filmed, often about daily life, travel, food, or shopping — as opposed to a YouTuber, which is a wider word covering anyone who posts anything there. So every vlogger is a YouTuber; not every YouTuber is a vlogger. In Taiwan people usually just say Vlogger or YouTuber in English inside a Chinese sentence, which is worth knowing so you are not searching for a Chinese word that nobody uses. Note the double g, from the same spelling rule that gives us blogger and jogger.