https://www.gamespot.com/articles/playstation-plus-for-ps4-everything-you-need-to-kn/1100-6461066/

Playing video games used to be so simple. You'd pop in a disc, press power, and you were good to go. Nowadays, things are a lot more complicated. Incredibly popular games/modes like Overwatch, Destiny 2, and GTA Online won't even let you play without an internet connection. And if you want to play most games online on a PS4, you'll need one other thing: a PlayStation Plus membership.

But don't worry, it's not exactly a mafia-style shakedown to empty your wallet each month. You get quite a bit back from your PS Plus membership. Here's everything you need to know about PlayStation Plus.