The tomato (solanum lycopersicum) is a fruit. It is shiny and smooth. It has many small seeds. It is very tasty. It is also very good for health. Most tomatoes are red. The tomato is green when it is unripe. It slowly changes color from green to red as it gets ripe. There are many different types of tomatoes. Some kinds of tomato are yellow or orange when they are ripe. Tomatoes are used a lot in Italian food. They are also used to make ketchup. Tomatoes are called fruit, because they contain seeds. Tomato seeds are dispersed by being eaten by animals. After being eaten the seeds pass through the animal's digestive system.