The CS720A0 has a maximum video resolution of 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.
A 1280 x 720 pixels maximum video resolution is in fact the best video resolution amongst all webcams of a comparable spec and age to the CS720A0.
Amongst comparable types of webcam the worst video resolution is 640 x 480 pixels.
Other webcams that have a video resolution of 1280 x 720 pixels currently available which you might also want to look at include cheaper webcams such as the Hercules HD Twist (£24.99).