CDS or combined defence services exam is conducted by UPSC twice a year. CDS is just like NDA & only difference is CDS is for graduates and NDA is for 10+2.
Selected candidates are admitted to various branches of armed forces like
• Indian Military Academy
• Officers Training Academy
• Indian Naval Academy
• Indian Air Force Academy
The recruitment of candidates to the different wings of Indian defence forces (Army, Navy and Airforce) is conducted through NDA exam.