Importance of 404 page

[ankur111]

Hi everyone,

I am checking a site and found that whenever we write something after the / of URL, it redirects to the page.

let say the domain is xyz.com
and when we write something like xyz.com/hdskdhkfoigo874787923
it redirects to xyz.com

Generally, the site shows 404 page for anything like that. Just want to know that how does it affect the site? And How should we deal with it?

Thanks