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, which is beneficial for plant growth, especially in colder climates. Greenhouses can be used to grow a variety of plants, including vegetables, flowers, and herbs. They protect plants from harsh weather conditions, pests, and diseases. By regulating humidity and temperature, greenhouses can extend the growing season, allowing gardeners and farmers to produce crops year-round, even in regions with extreme weather.