As I have seen a common mistake done by the students, so I am going to explain what is this term is all about.
Limit is the base of calculus which was introduced by Newton. The word 'Limit' states the extent to which any variable's value can tends to.
It means we try to find out the nearest value of the particular point from the left as well as from the right side of the graph over that point. And they are termend as the Left Hand Limit and as the Right hand Limit of the given equation.
So, In order to find out the clossest possible value for any point is said to be discussed in Limits.
Then comes the role of derivative and then differentiation .