What is the difference between chlorophyll a b c d?

Chlorophyll a, b, c, and d are different types of chlorophyll pigments that absorb light for photosynthesis in various organisms. Chlorophyll a is the primary pigment found in all photosynthetic organisms, while chlorophyll b, found mainly in green plants, assists in capturing light energy. Chlorophyll c is present in some algae, particularly brown algae and diatoms, and helps in light absorption at different wavelengths. Chlorophyll d, found in certain red algae, has a unique structure that allows it to absorb far-red light, expanding the range of light available for photosynthesis.