Is fraction has the same meaning with rational in number theory? I'm unable to get the difference between fraction and rational, we say $\frac{a}{b}$ is rational number if a and b are two integer with $b\neq 0$, and we can say also $\frac{a}{b}$ is a fraction but i don't know any reason for that, my question here is :Is fraction has the same meaning with rational in number theory ?
Note: one other thing wich is mixed me is that wolfram alpha  considered rational number as fraction as shown here
Edit: I have edited the question just for specification and clarification 
according to the gaven answers without any change in the meaning of question 

Any number written in the form $\frac{a}{b}$ is a fraction provided $b \neq 0$, because division by zero is not defined.
Thus $\frac{2}{3}$, $\frac{221}{5}$ and $\frac{\pi}{2}$ are all fractions but only $\frac{2}{3}$ are $\frac{221}{5}$ rational since the decimal representation either repeats $\frac{2}{3} \approx 0.666666666666666666666$ with the 6's repeating for ever or terminates $\frac{221}{5} = 44.2$.
$\frac{\pi}{2}\approx 1.5707963...$  Is not a rational however as the decimal expansion neither ends or repeats.
If we add the requirement that $a$ and $b$ are both integers then you have the fractional representation of a rational number. I would not call $0.5$ a fraction however as it is not written in the correct format, though it is certainly a rational number. I would call $\frac{1}{2}$ a fraction though and they both have the same value.
