Steroids are synthetic substances that mimic natural hormones like testosterone. Medically, they are used to treat conditions such as delayed puberty, muscle loss, and certain types of anemia. Anabolic steroids are also popular among athletes and bodybuilders to enhance muscle growth and performance. However, misuse can lead to serious side effects including liver damage, hormonal imbalance, mood swings, and heart problems. Safe use under medical supervision is essential, and non-medical use is often illegal and discouraged.