Answer
$\frac{2}{3}$
Work Step by Step
The absolute value of a real number $a$, denoted by $|a|$, is the distance between $a$ and 0 on a number line. Therefore, $|a|=a$ if $a\gt0$, and $|a|=-a$ if $a\leq0$.
Also, if $a$ is a number, then $-(-a)=a$.
Therefore, $|-\frac{2}{3}|=-(-\frac{2}{3})=\frac{2}{3}$.