Beta is the measurement of how an equity or product moves with the underlying instrument it is attached with. Beta is measured as follows, if a product has a Beta of 1 or above, than the product is more volatile, but if it falls below 1, it will be less volatile. When a Beta is at 1, that means it will move in rhythm with the asset it is tied with. For example, the ETF ticker SPY that follows the S&P 500 will have a Beta near 1 because it is supposed to follow the S&P 500 Index. Conversely, if you invest in an inverse ETF, it will likely be near a 0 Beta because it moves in the opposite direction of the market it is intended to follow.