Plastids are specialized organelles found in the cells of plants and some algae. They play a crucial role in the storage and synthesis of important compounds. The most well-known types of plastids include chloroplasts, which are responsible for photosynthesis, and chromoplasts, which give color to fruits and flowers. Plastids contain their own DNA and can replicate independently within the cell. They are involved in the production of starch, lipids, and pigments, contributing to the overall metabolism and energy storage of the plant. Their diverse functions make plastids essential for plant growth and development.