Resolutions are measured in pixels. Therefore, the higher the resolution means better image and video quality. Basic resolutions include 240p, 360p, 480pand 1080p, 720p and 2040p etc. The majority of the time the 720p and 1080p resolutions suffice for high-quality video and images. If you're looking for higher resolution, go for 2040 or perhaps higher. The reason for this is that higher resolutions will be used for publishing videos on various websites. The iPhone has a good resolution for both its video and image. Pixels are used in conjunction with an appropriate resolution to determine the quality.