When we say "x approaches 0," it means that the input (x-value) of the function gets closer and closer to 0 without actually reaching it.
One-Sided Limit: A one-sided limit exists when the function approaches different values from the left or right side of a specific point.
A two-sided limit exists when the function approaches the same value from both the left and right sides of a specific point.
A removable discontinuity occurs when there is a hole in the graph of a function that can be filled by redefining or reevaluating that point.