Stem cells are special cells in our bodies that have the unique ability to develop into many different types of cells. They can divide and renew themselves for long periods, making them essential for growth and healing. For example, when we get a cut, stem cells help produce new skin cells to repair the damage. There are two main types of stem cells: embryonic stem cells, which come from early-stage embryos, and adult stem cells, found in various tissues like bone marrow. Scientists study stem cells to understand diseases better and explore potential treatments, such as regenerating damaged organs or tissues.