Retirement Planning is the discipline of strategically saving for retirement through vehicles like 401k, IRA, Roth IRA, and other investment accounts. It involves understanding contribution limits, tax implications, employer matching, investment allocation, and long-term wealth building. The goal is ensuring comfortable retirement while optimizing taxes and managing risk. Professionals in this field work with individuals to create retirement strategies, advise companies on 401k plans, and help optimize withdrawals and tax efficiency in retirement.