What are scorestreaks in multiplayer of Black Ops 2

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First time playing online fps before, so I've no idea what I'm doing. But I'm getting a hang of it. But I was wondering what scorestreaks are. I know you need points for that, but where exactly can I see my points?
And I tried selecting 3 random scorestreaks but I don't know how to use it in-game!

Best Answer

After choosing your kill-streaks, you need to get in-game points by getting kills, assists, or scoring objectives.
You can see your progress on the right hand-side of your HUD, there is a meter that shows you how much points you have earned in this life. When you get enough points for your first kill-streak you will be able to activate it by pressing the right directional pad (on PS3 or Xbox). If you collect your second and third kill-streaks, you can choose which to activate with up and down and the directional pad.

PS- when you die, the meter will start over again from beginning. Hope this helped :)