Investing: A behavior centered around the long term (more key words) buying of an asset, security, currency, digital currency, or other financial instrument for the purpose of building wealth. The goal in investing is to hold an asset that will only (if you were trained to do your research properly) appreciate over the long term. Eventually, an investor may want to sell some of his or her assets for a variety of reasons, but selling the bulk of an asset itself is not really the goal for long term investing.