Camera Techniques and Purpose

Camera Techniques 

• It delivers information. Wide shots provide context and inserts highly important details or emotions.
• It creates impact. Closeups enhance intensity; high and low camera angles suggest power or lack of it; 
• It facilitates editing. Through contrast with the preceding and following angles, it lets the editor make invisible, or at least unobtrusive, edits.
• It enhances performance. Closer shots intensify performances; longer shots make them less intense.

I.e. 

The camera’s distance from the subject and the focal length of the lens together determine how much of the subject is visible in the frame. These factors also impact the subject’s apparent size. Such as in this image