What is the difference between writing "Dear Dr. Williams", or saying "Hey Doc"

Dear Dr. Williams is more formal than Hey Doc.

"Dear Dr. Williams" is a form of Formal Writing while "Hey Doc" is Informal Writing

Explanation:

you use formal writing in situations where informal is inappropriate.

there is 2 main differences, basically which are the users and the market. the other difference is the kind of content

people who use tik tok are mainly people from east asia, kind of like the app douyin. musically, on the other hand, are used by people from america or european countries.

while tik tok videos show things like daily life videos, comedy, or just funny videos, musically are like people mimicking songs with their own actions, 'imitate' singers and video clips.

hope this !