What is 401(k) retirement savings plan ?401(k) is a retirement savings plan for a working individual in United States of America. 401(k) plans are sponsored by your employer. In this post you will find out a quick overview of the rules and regulations and the most important things you need to know about 401(k) investments.401(k) investment options Money contributed to 401(k) plans is invested in various mutual funds investing in Stocks, Bonds or...