The No Claim Bonus (NCB) in car insurance is a reward offered by insurers in India for maintaining a claim-free policy year. This bonus, starting at 20% and potentially reaching 50%, provides a discount on insurance premiums during renewal. NCB accumulates with consecutive claim-free years, encouraging policyholders to consider out-of-pocket payments for minor repairs to preserve their bonus. Understanding and checking accumulated NCB is crucial for car owners to make informed decisions and save money on their insurance.