You can watch it on 3 different devices simultaneously

Connections = amount of streams allowed on that account at one time. It could be for different devices, or for multiscreen if you want to use that. Multiscreen is great for NFL season.

Can be handy for recording, watch one thing record another.

Also when the word connection is used dont forget to ask if its ip locked cause if so dont let your fam/friends "borrow" it account will get banned quick!!

3 diffrent devices

In the case of like Netflix. Package one is one device streaming at a time. Package 2 is up to 3 simutaneously devices at once. And then package 4 is unlimited. The long and short of it is the never of devices streaming from the same account all at once.

If you have 3 TVs around the house you can get that one service running on all 3 of them. Of course you need TVs that come with an IPTV app or use Firesticks or Nvidia Shield on all 3.

You can use 3 tv or 3 phones on 3 connection