Check out example codes for "how to get rid of underline for links in css". It will help you in understanding the concepts better.

Code Example 1

a, a:hover, a:focus, a:active {
      text-decoration: none;
      color: inherit;

Code Example 2

a:link - a normal, unvisited link
a:visited - a link the user has visited
a:hover - a link when the user mouses over it
a:active - a link the moment it is clicked

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