Compute $\dbinom{4}{0}+\dbinom{4}{1}+\dbinom{4}{2}+\dbinom{4}{3}+\dbinom{4}{4}$.
We have \begin{align*}
\dbinom{4}{0}&+\dbinom{4}{1}+\dbinom{4}{2}+\dbinom{4}{3}+\dbinom{4}{4} \\
&= \dfrac{4!}{0!4!} + \dfrac{4!}{1!3!} + \dfrac{4!}{2!2!} + \dfrac{4!}{3!1!} + \dfrac{4!}{4!0!} \\
&= \dfrac{4\cdot 3\cdot 2\cdot 1}{4\cdot 3\cdot 2\cdot 1} + \dfrac{4\cdot 3\cdot 2\cdot 1}{1\cdot 3\cdot 2\cdot 1} + \dfrac{4\cdot 3\cdot 2\cdot 1}{2\cdot 1\cdot 2\cdot 1}\\
&\qquad + \dfrac{4\cdot 3\cdot 2\cdot 1}{3\cdot 2\cdot 1\cdot 1} + \dfrac{4\cdot 3\cdot 2\cdot 1}{4\cdot 3\cdot 2\cdot 1} \\
&= 1 + 4 + \dfrac{4\cdot3}{2} + 4 + 1 \\
&= 1 + 4 + 6 + 4 + 1 \\
&= \boxed{16}.
\end{align*}Notice that this is $2^4$. There is an explanation for this: $$\dbinom{4}{0}+\dbinom{4}{1}+\dbinom{4}{2}+\dbinom{4}{3}+\dbinom{4}{4}$$is the sum of the number of ways to choose $0$, $1$, $2$, $3$, or $4$ out of $4$ objects. This accounts for every way of choosing any number of the $4$ objects. There are $2\times 2\times 2\times 2 = 2^4$ ways of doing so, because there are two options for each object: choose that object or don't choose it.