what does margin do in css code example

Example 1: margin css

/* Apply to all four sides */
margin: 1em;
margin: -3px;

/* vertical | horizontal */
margin: 5% auto;

/* top | horizontal | bottom */
margin: 1em auto 2em; 

/* top | right | bottom | left */
margin: 2px 1em 0 auto;

/* Global values */
margin: inherit;
margin: initial;
margin: unset;

Example 2: css margin

#blockOrInline-Block {margin: 0px/*top*/ 0px/*right*/ 0px/*bottom*/ 0px/*left*/;}

Example 3: css code for margin

body {
  margin: 0px;
}