Retirement plans are financial strategies that individuals set up to secure their future after they have stopped working. These plans can come in different forms, depending on the individual's preference. Some popular retirement plans include pension plans, 401(k) retirement plans, Individual Retirement Accounts (IRAs), Roth IRAs, defined-benefit plans, and annuities. Other synonyms for retirement plans could include post-employment financial strategies, retirement investment plans, retirement saving schemes, senior financial planning, golden years savings, or mature-age investment strategies. It's important to choose the retirement plan based on your financial goals, age, income, and lifestyle, as there is no one-size-fits-all solution to retirement planning.