Defined benefit: The pension benefit funded by your employer. You must have enough service years to qualify for the pension (10 years or 5 if at least one year is earned over age 44). Once you qualify, you are guaranteed a lifetime benefit at retirement.
See the “Defined benefit” section below for more information about this part of your retirement.
Defined contribution: The investment component funded by you. You chose or defaulted into a contribution rate when you began service in Plan 3.
Contributions to your retirement plan are mandatory and are deducted from your gross salary. The money is invested into the investment fund(s) you choose; change your investment selections at any time.
Once chosen, your defined contribution rate is permanent unless you change public sector employers.
You can withdraw defined contribution funds any time after leaving DRS-covered employment. Early withdrawals are subject to the additional 10% federal withholding tax.
Don't Invest In Your Company's Pension Plan - Dave Ramsey Rant
See the “Your contributions” section below for more information about this part of your retirement.