Practice is the act of rehearsing a behavior over and over, or engaging in an activity again and again, for the purpose of improving or mastering it, as in the phrase "practice makes perfect". Sports teams practice to prepare for actual games. Playing a musical instrument well takes a lot of practice. It is a method of learning and of acquiring experience. The word derives from the Greek "πρακτική" (praktike), feminine of "πρακτικός" (praktikos), "fit for or concerned with action, practical" and that from the verb "πράσσω" (prasso),"to achieve, bring about, effect, accomplish". In American English practice is used as both a noun and a verb, but in British English there is a distinction between practice, used as a noun, and practise, used as a verb (see spelling differences).