What are wide-angle lenses, medium-focus lenses and telephoto lenses? What are their functions?

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Simply put,

Wide angle, suitable for shooting scenery, the lens is between 10mm-35mm, characterized by a particularly wide viewing angle, and the fisheye lens exceeds 180 degrees;

The medium focal length is mainly suitable for portrait shooting, generally about 70mm, 50- 135mm, and this focal length should be the highest degree of reduction;

200mm, 300mm, 400mm or even 600mm, these are telephoto lenses, suitable for sneak shots, such as animals and sports fields, and take some close-ups. In addition, telephoto lenses are often used to shoot the micro world (macro) because the background is narrow and the theme is prominent.