A proverb is a short and wise saying with a deep meaning. It presents a truth or some bits of useful wisdom. It is a short, well-known pithy saying generally based on common sense or practical experience.
Proverbs are often borrowed from similar languages and cultures, and sometimes come down to the present through more than one language. Nothing defines a culture as distinctly as its language, and the element of language that best encapsulates a society's values and beliefs is its proverbs. They are usually metaphorical and often, for the sake of memorability, alliterative.
A few examples of proverbs are “all that glitters is not gold” which refers to a warning that something or somebody may not be so good, valuable, etc. as it or he appears to be on the surface, “a friend in need is a friend indeed” which means that a friend, who helps one when one needs help, is a true friend.