Cells are tiny building blocks that make up all living things, including plants, animals, and humans. Just like a house is made up of bricks, cells are the building blocks that makeup everything living. These cells are so small that we can't see them without a special microscope. Cells do important jobs, like helping us grow, making sure we stay healthy, and keeping our bodies working properly. They are like little factories that work together to make sure our bodies function the way they should.