A greenhouse is a structure designed to create a controlled environment for growing plants. It is typically made of glass or transparent 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. Greenhouses can vary in size, from small backyard setups to large commercial facilities. Inside a greenhouse, various plants can be cultivated, including flowers, vegetables, and herbs. The controlled environment allows for year-round growing, regardless of the external climate. Many gardeners and farmers use greenhouses to enhance plant growth and increase crop yields, making them an essential tool in modern agriculture.