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!