How do you classify  x^2 - y^2 = 4?

Given equation: ${x}^{2} - {y}^{2} = 4$
$\setminus \frac{{x}^{2}}{4} - \setminus \frac{{y}^{2}}{4} = 1$
$\setminus \frac{{x}^{2}}{{2}^{2}} - \setminus \frac{{y}^{2}}{{2}^{2}} = 1$
Above equation represents a hyperbola: $\setminus \frac{{x}^{2}}{{a}^{2}} - \setminus \frac{{y}^{2}}{{b}^{2}} = 1$