A greenhouse is a structure designed to create a controlled environment for growing plants. It is typically made of glass or clear plastic, allowing sunlight to enter while trapping heat inside. This helps maintain a warm temperature and protects plants from harsh weather conditions, pests, and diseases. Inside a greenhouse, various plants can thrive year-round, regardless of the external climate. Gardeners and farmers often use greenhouses to cultivate fruits, vegetables, and flowers. The controlled environment allows for better growth and can lead to higher yields compared to traditional outdoor gardening methods.