The most effective way of communicating involves more than just the words coming out of your mouth. Studies suggest that using your hands to gesticulate while you talk can be extremely beneficial, specifically by helping you learn and increasing your ability to retain information.
Talk To The Hand
Psychologists believe that talking with your hands is not just mindless arm waving, but may actually be tied to speech. They also believe that the gestures that accompany speech reduce "cognitive load," which is described as the mental energy you use to keep things in your working memory.
Watching someone gesticulate while speaking is beneficial too. Studies suggest that watching someone use their hands while they talk may help you better understand and retain the information they're conveying.