Type 1 diabetes, also known as T1D or juvenile diabetes, is a chronic autoimmune disease in which the body's immune system attacks and destroys the insulin-producing beta cells in the pancreas. Insulin is a hormone necessary for the body to use glucose (sugar) for energy. Without insulin, blood glucose cannot enter the body's cells and builds up in the bloodstream, causing high blood sugar levels. This condition typically starts in children and young adults but can develop at any age. The symptoms include frequent urination, increased thirst, hunger, weight loss, blurry vision, fatigue, and slow wound healing. There is no known way to prevent type 1 diabetes, and treatment requires lifelong insulin therapy through injections or an insulin pump, along with diet, exercise, and lifestyle management. Type 1 diabetes accounts for about 5-10% of all diabetes cases and can lead to serious complications if not managed properly, such as diabetic ketoacidosis, heart disease, stroke, kidney failure, and eye damage. Despite its challenges, with proper care, people with type 1 diabetes can live long, healthy lives.