When taking portraits, what does four times the telephoto mean?

Telefocus means that the lens can be extended to a relatively long distance, such as 10 times, that is, the lens of 35 mm is extended to 350 mm, which is convenient for capturing distant scenes; Short focus generally refers to near focus, or macro, that is, you can shoot the scenery close to the lens, which is generally used to shoot the words in the book; Focusing is focusing, which makes the scene on the lens or display clear.