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From WIKIPEDIA

Chloroplasts ( /?kl?r?plæsts/) are organelles found in plant cells and other eukaryotic organisms that conduct photosynthesis and other chemical reactions. Chloroplasts capture the sun's light energy, store it in the energy storage molecules ATP and NADPH and use it in the process called photosynthesis to make organic molecules from carbon dioxide and free oxygen from water.[1]
All chloroplasts contain the green pigment chlorophyll a, but not all chloroplasts are green because accessory pigments may be present that can change or override the green colour. The word chloroplast (χλωροπλ?στης) is derived from the Greek words chloros (χλωρ?ς), which means green, and plastis (πλ?στης), which means "the one who forms". Chloroplasts are members of a class of organelles known as plastids.