How Do You Know $\frac{y^2}{16}-\frac{x^2}{9} = 1$ Is a Hyperbola? Describe the Hyperbola

How Do You Know . . . . ?
-How Do You Know . . . . that $\frac{y^2}{16}-\frac{x^2}{9} = 1$ is a hyperbola? Describe the hyperbola