What is $\frac{1}{2} + \frac{1}{3}$?
We want to have the least common denominator, $2 \cdot 3 = 6$, in the denominator when we add the two fractions.  We write one half as $\frac{1}{2} \cdot \frac{3}{3} = \frac{3}{6}$. Also, we write one third as $\frac{1}{3} \cdot \frac{2}{2} = \frac{2}{6}.$ Adding these, we obtain $\frac{3}{6} + \frac{2}{6} = \frac{5}{6}$, which is in the most simplified form. So, $$\frac{1}{2} + \frac{1}{3} = \boxed{\frac{5}{6}}.$$