Reverb is added to create width and depth to the track as well as elevate an otherwise boring sound. But just like with the other facets of mixing, it is often overlooked or misunderstood. To effectively apply it, you must know how much to use and how to adjust its various parameters.
What are the reasons why we add reverb? First is to make the recorded track sound like it’s in a specific acoustic environment. Next is to add some personality and excitement to a recorded sound. Lastly, to make a track sound bigger or wider than it really is.
Read more about this here: https://www.prosoundweb.com/channels/recording/in_the_studio_timing_the_reverb_delay_to_the_track/