Diploma in Mechanical Engineering is a three-year technical programme offered by polytechnic institutes in India under the Engineering & Technology stream. The course develops a foundation in mechanical engineering principles such as engineering mechanics, strength of materials, thermodynamics, fluid mechanics, manufacturing processes, and machine design. A significant portion of learning is practical, including workshop training, CAD practice, metrology, and labs related to thermal and production engineering. Students also learn basics of electrical/electronics, engineering drawing, mathematics, and communication to support multidisciplinary work environments. Many institutes include industrial visits, minor projects, and a final-year major project or industry-based training to improve job readiness. After completion, diploma holders can work in production, maintenance, quality, testing, and CAD roles across automotive, manufacturing, power, HVAC, railways, and process industries. Candidates may also opt for lateral entry admission into the second year of B.E./B.Tech (where applicable as per state/university rules).