Thymus

The thymus is a small, specialized organ located behind your sternum (breastbone) that plays a vital role in your immune system. Its main function is to produce and mature T-cells, a type of white blood cell essential for fighting infections and detecting abnormal cells like cancer. The thymus is most active during childhood and adolescence, gradually shrinking as you age. Despite its size decrease over time, it is crucial during early life for building a robust immune defense. Overall, the thymus acts as a training center for immune cells, helping your body recognize which cells belong and which are threats.