calculus - About $ lim_{xrightarrow 0}frac {sin x}{x} = 1$

I do not understand how $$\lim_{x \to 0} \frac{\sin x}{x} = 1$$ As if $$ x = 0, \frac{\sin (0)}{0} = \frac {0}{0} $$
So if someone could explain this I would appreciate it!
Thanks!