To divide fractions, you multiply the first fraction by the reciprocal of the second fraction.

$\frac{1}{3} \div \frac{1}{4} = \frac{1}{3} \times \frac{4}{1} = \frac{1 \times 4}{3 \times 1} = \frac{4}{3}$

So, $\frac{1}{3} \div \frac{1}{4} = \frac{4}{3}$.

Would you like any further details or clarifications?

Here are 5 related questions for practice:

1. What is $\frac{2}{5} \div \frac{3}{7}$?
2. Simplify $\frac{4}{9} \div \frac{2}{3}$.
3. How do you multiply $\frac{3}{8} \times \frac{5}{6}$?
4. What is the reciprocal of $\frac{7}{12}$?
5. How do you divide mixed numbers, like $1 \frac{1}{2} \div \frac{3}{4}$?

Tip: To divide fractions, always remember to multiply by the reciprocal of the divisor!