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Chloroplast

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Simplified structure of a chloroplast

Chloroplasts ( /?kl?r?plæsts/) are organelles found in plant cells and other eukaryotic organisms that conduct photosynthesis. Chloroplasts capture light energy, store it in the energy storage molecules ATP and NADPH and use it in the process called photosynthesis to make organic molecules and free oxygen from carbon dioxide and water.[1]

Chloroplasts are green because they contain the chlorophyll pigment. 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.

Chloroplast is the area of the plant cell which contains chlorophyll, the green pigment responsible for photosynthisis.  Other chloroplasts contain other chemicals which give those plants their respective colors.  So it is an area of a plant cell that holds the pigment colors.