I know those are things in both world of warcraft and guild wars 2. There are two teams and 5 players on each team. The battleground zones are large with two bases at opposite ends. Sometimes there would be bonus objectives to help either team get points. The modes can be destroy enemy team base and win, capture points/resource gain, pvp dungeons, etc.
I feel like eso should get more variety of battlegrounds and game modes. That will make pvp a lot more fun and enjoyable.
The small scale 3 team battlegrounds are good even know those get chaotic and hard to tell who's winning along with how to win.