Compare Fractions: Find the Symbol Between 3/4 and 6/8

To compare the fractions $\frac{3}{4}$ and $\frac{6}{8}$, we will first simplify each fraction.

First, $\frac{3}{4}$ is already in simplest form since the GCD of 3 and 4 is 1.

Now, for the fraction $\frac{6}{8}$, we find the GCD of 6 and 8, which is 2. Simplifying $\frac{6}{8}$ by dividing both the numerator and the denominator by 2 gives:

$\frac{6 \div 2}{8 \div 2} = \frac{3}{4}$

Both fractions, $\frac{3}{4}$ and $\frac{6}{8}$, simplify to $\frac{3}{4}$.

Since they simplify to the same form, they are equivalent:

$\frac{3}{4} = \frac{6}{8}$

Therefore, the correct missing sign is $\boxed{=}$.

$=$