The highest video resolution supported by the Nikon S9100 is 1920 x 1080 pixels. That's over six times the video resolution of the most common video resolutions of 640 x 480 pixels (which is also supported by this camera). In addition, this Nikon camera support video resolutionss of 320 x 240 pixels and 960 x 540 pixels and 1280 x 720 pixels. A video resolution of 1920 x 1080 pixels is equivalent to Full HD video. You will require a Full HD TV or better to appreciate this level of detail.
A 1920 x 1080 pixels video resolutions is actually the best supported video resolution across all comparable spec cameras that have been available for a similar time to the S9100.
Across similar types of digital camera the worst supported video resolution is 320 x 240 pixels.