Resolution
(AN APPROPRIATE TOPIC FOR EARLY JANUARY)
Resolution is

The ability of an optical system to distinguish between signals that
are spatially near or spectrally similar.

Spatial

Spectral

Temporal

Radiometric
Spatial resolution

Pixel size or IFOV
1, 10, and 30m resolutions
Spectral Resolution

Dimension and number of specific wavelength intervals in the EM
spectrum to which a sensor is sensitive
Temporal Resolution

How often the same area is recorded.

Ie. 16 days for Landsat
Radiometric Resolution

Sensitivity of the instrument

6 bit (MSS), 64 levels

8 bit (TM ), 256 levels.