Power sanders have been around for quite some time, and odds are you've used a few of them in your lifetime. Specialized tasks require specialized tools, but there is one type that has much more versatility than all the rest.
The following video goes into more detail on the different types of sanders and their best uses:
Random orbit sanders is easily the most versatile type which can easily transform any DIY project into one that you'll remember. They work by sanding in an orbital action giving you the power of a belt sander, but the finishing action of an orbital sander. The aggressive nature mixed with a sander which allows you to put the finishing touches makes these some of the most popular.
The best part of a random orbital sander is that due to it's random action, no material gets sanded along the same patch more than once. This means there are no swirl marks seen in your workpiece which is often the problem with other types of sanders such as belt sanders.
The best models have features such as dust collectors which help keep the work area clean. Other features to look for include a trigger switch, noise, ergonomics, and a soft grip handle. This type of sander doesn't have to cost a fortune as there are some amazing Random Orbit Sanders Under $100 you can choose from.