Your Cells Contain Your DNA
Your body is made of trillions of building blocks called cells, the same way a house is built from bricks. There are many types of cells: brain cells, heart cells, skin cells, and more!
Almost every cell has DNA, or deoxyribonucleic acid. Most cells have the same DNA but each type of cell "reads" different parts of it. DNA tells the cell how to develop and function.
Most DNA is stored inside a compartment in the cell called the nucleus, similar to an egg yolk inside an egg. There is also some DNA housed outside the nucleus, in structures called mitochondria. All of your DNA together is called your genome.