The highest video resolution of the TY-CC20W is 1280 x 720 pixels. That's over three times the video resolution of the most frequently found maximum video resolution of 640 x 480 pixels. The best video resolution of all webcams of this type and age is 1920 x 1080 pixels and the worst is 640 x 480 pixels.
It may also be worth also looking at one of the alternative webcams that have a video resolution of 1280 x 720 pixels currently available including the Microsoft LifeCam Studio (£52.27) which is cheaper; or the Logitech C930e (£79.19) which has a better Rating.
Webcams with a higher video resolution that might also be worth looking at include the LG AN-VC500 (£59.00) (1920 x 1080 and cheaper).