Learning about 401k benefits is a good way to begin strong retirement planning. So if you're looking to know what is a 401k, it is a retirement account that is made for employees to save and invest for their future. The primary benefits of 401k plan are that you can save money on taxes, and that your employer may provide matching funds for your contributions. These advantages make 401k plans a good incentive for long-term investing. If you're wondering, what are the advantages of 401 k, there are many, such as the potential for growth, financial stability, and retirement income support.