Diabetes is a chronic condition that affects how the body uses blood sugar (glucose), its main energy source. It occurs when the body either doesn’t produce enough insulin or can’t use it properly, leading to high blood sugar levels. The main types are Type 1, Type 2, and gestational diabetes. Symptoms include frequent urination, extreme thirst, fatigue, and slow wound healing. If not managed, diabetes can lead to serious complications like heart disease, kidney damage, and vision loss. Treatment involves lifestyle changes, blood sugar monitoring, medication, and sometimes insulin therapy to maintain healthy glucose levels and prevent complications.