$\pi$ and $\frac{22}{7}$ are

$\pi$ is an irrational number because its decimal expansion is non-terminating and non-recurring. The fraction $\frac{22}{7}$ is a rational number because it is explicitly written in the form $\frac{p}{q}$ where $p$ and $q$ are integers and $q\ne 0$. Note that $\frac{22}{7}$ is merely an approximate value used for $\pi$.