Chlorophyll have an absorption spectrum for light that varies with the frequency in nanometers. These wavelength values in nanometers are actually what we perceive as colors like red and blue.
Leaf tissue structure is strongly oriented around making chlorophyll reachable to sunlight.
This is a map of chlorophyll concentration on the planet.
Chlorophyll is responsible for the conversion of sunlight into plant matter-and-energy via photosynthesis and is a fundamental link in the chain providing and sustaining life on earth as we know it.