The terms "utility clubs" and "hybrid clubs" are generally used interchangeably. They denote a category of clubs that combine elements of both woods and irons into their design.
This combination of elements from both irons and woods adds up to having having technical features that aid in getting the ball airborne, that dampen the effects of mishits, and other things that are pluses.
Most hybrids are designed to replace long irons (2-, 3-, 4- and sometimes 5-irons in a golfer's bag, and when you hear it said that hybrids are "easier to hit," this is almost always meant in comparison to the long irons the hybrids are meant to replace.
For this reason, most golfers would do well to consider, if shopping for a brand new set of clubs, a "hybrid set" or "hybrid irons set." In hybrid sets, the long irons (typically 3- and 4-irons) are replaced with utility clubs designed to hit the ball the same distances, but with greater forgiveness and other game-improvement features built in.