I have the sb 900 speedlight, does it have a built in wireless flash trigger?

Do I need to get a wireless flash trigger? Also would anyone recommend a wireless flash trigger… I keep seeing a product from cowboy studios but I don't know WHAT IN THE world to get. I have a Nikon d7000

I also have a sb900
I was confused as how I could trigger it remotely without using my radio controller
Turns out you can adjust your on camera pop-up flash as trigger

But then the pop-up flash also lighted the scene.

In the menu you can disable/change the pop-up flash's setting.

It will still fire and trigger the sb900, but will not affect the scene.

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Set the built-in flash to " - - " in the menu for this.

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Pocket Wizard is the most favored brand for triggering I believe. It's not sold in my country so I went with a different brand. Pretty happy with it though.

Look for "commander" or "creative lighting system" or "CLS" in your manual. The SB-900 will act as your main, master, or remote, depending on where you put the switch. It works optically - off of the light from a Nikon flash - and not a radio signal. I could take pages to explain or you could read it in your manual where there are illustrations to help.

If you want to learn TONS about this, buy Joe McNally's book "The Hot Shoe Diaries."

Additional: I needed to look at the camera to get the words right…

Look for the menu labeled e3 under Custom Settings: Flash control for built-in flash.
Choose Commander Mode.
For the first trial, don't change anything at all.
Pop up your pop-up flash.
Turn the SB-900 on putting the switch in the "Remote" position.
Place the SB-900 somewhere to your left so the little red sensor window is facing in your general direction. (You can swivel the flash head 180° if you want the SB-900 on your right later on, but you are just learning how to trigger the SB-900 as a remote now.)
Take a picture and kind of keep an eye out for the flash from the SB-900.
You will hear a couple of beeps from the SB-900 to confirm that it fired.

Once you see how this works, feel free to read more in the manual and learn about altering the settings for the built-in flash or the remote, which is probably still set on channel A, which is the default. You have a lot of reading and experimenting to do, but now you have the basic information.

For what it's worth, here are about 100 samples. Some have the set up explained in the caption.