A gazetted officer is an officer whose appointment is published in the official Gazette of India — typically Group A and Group B officers. They can attest documents and hold executive or supervisory authority. You become one by clearing exams like UPSC Civil Services, SSC CGL (for inspector and ASO posts), or state PSC exams. Group A posts need graduation; some technical posts need specific degrees. After selection and training, your appointment is notified in the gazette.