You can see resolution easily. For example, If you see video for Youtube, you can choose quality. This is resolution. You can see picture too. If picture has good resolution, you can see very very tiny something.
So Resolution refers to the number of pixels or individual color dots in an image. A high resolution image has more dots, which allows it to display more detail. Resolution has many quality. 1080p is best quality of this resolution.
- 240p (320*240)
- 480p (720*480)
- 720p (1280*720)
- 1080p (1920*1080)
Big pixel is not good. Small pixel is good. You should remember.
This site is example about high resolution.