Given function f(x)=x2. Observe that as x takes values very close to 0 , the value of f(x) also approaches towards 0 .
We say x→0limf(x)=0
(i.e., the limit of f(x) as x tends to zero equals zero). The limit of f(x) as x tends to zero is to be thought of as the value f(x) should assume at x=0.