What are the different types of retirement plans?

Answer- There are following types of retirement plans.
1) Government- Sponsored retirement plans- Social Security plan
2) Personal Plans- IRS, that is the most popular retirement plan available in USA.
3)Annuities:
4) Employer Sponsored Plans, that is 401k retirement plan.
There are two types of Employer Sponsored plans:
a)Defined benefits plan and b) Defined Contribution Plans