Have you ever tried to buy or sell a random option contract and then become frustrated with how the price suddenly moved or how difficult it was for you to get in or out of the trade? That happens a lot to the best of us! Whenever there aren't a lot of options open (open interest) then weird things can happen with the options prices. Therefore, this screener can be used to quickly zero in on the most liquid options having the most open interest.
So if you're considering trading an option on a particular stock and you're flexible or not sure of which price or expiration, then you might just want to gravitate to the same option that everyone else is trading, and this screener will do that for you. Just filter by the ticker and sort by the OI (which is the default sort).