A (less common) method of [[Quadrature|Numerical Integration]] for solving [[Differential Equations]]. For each iteration $z_i$, $ \huge \begin{align} k_{1} &= f(t_{i},z_{i}) \\ k_{2} &= f(t_{i}+h, z_{i}+hk_{1}) \\ \hline z_{i+1} &=z_{i}+ h \pa{ \frac{k_{1}+k_{2}}{2}} \end{align} $