There are many. The top searched results are on Google. But I want to ask one thing, what exactly do you mean when you are saying security? Coz as far as I know VPN’s don’t provide any sort of security. They just put a decoy IP up front in front of your original one.
Hackers will and can still see your original IP and hence, no security!
However, there are plenty of vpns that can fall under “BEST VPN” tag.
Just seach best vpns and you’ll have your results in front of you 🙂