I was watching how to make a nintoaster, that is, an NES (Nintendo Entertainment System) in the form of a toaster. The video is here. One of the things he does in the video is building a video-amp circuit for the video signals from the NES. The circuit looks like this (13:40 in the video).
I believe I understand somewhat what this circuit does (but feel free to point out if I'm wrong). The "VIDEO IN" signal controls the state of the transistor, that is how much current is flowing through it. The \$33\Omega\$ resistor is there to limit the current, and the "VIDEO OUT" is the output signal.
But I'm not sure why there is a \$220\Omega \$ connected to ground. What is the purpose of that resistor, if it even has any?