Why we use event handling in JS?

Answer 1

It is used to make webpages more attractive and user friendly.
Like : generally we like to use mouse to select anything in system instead of selecting it by keyboard

Answer 2

To trigger code.

Answer 3

to make our website dynamic

Answer 4

suppose you, want some animation to happen when user opens your website,
so opening your site can be considered an event , so based on that event it ll start animation function automatically when event detected.

that's y it's critical, for dynamic websites