After decades of working, many people envision retirement as a time when they can finally kick back and do whatever it is that their heart desires. However, in most cases, this won't be completely possible without making sure you're financially secure when that time approaches.

Unfortunately, just saving won't be enough for most people -- it's going to take investing to grow your funds. Luckily, it doesn't have to be hard or time-consuming; it just takes a solid, well-rounded portfolio to carry you throughout your career.

A well-rounded retirement doesn't require purchasing dozens or hundreds of stocks, either. It can be done with a few exchange-traded funds (ETFs) that cover a lot of ground at once. Here are four ETFs that can serve as your foundation.

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Source Fool.com