One-sided Limit: A one-sided limit exists when approaching from only one direction (either left or right) instead of both directions simultaneously.
Discontinuity: A discontinuity occurs when there is a break or jump in the graph of a function, meaning there is no defined value for some point(s).
Indeterminate Form: An indeterminate form arises when evaluating limits where there isn't enough information to determine the limit's value directly. Examples include 0/0 and ∞/∞.