This document provides an overview of key concepts related to limits and continuity in calculus, including: 1. Defining what a limit is graphically as the value a function approaches as the input gets closer to a number without reaching it. 2. Explaining how to find limits algebraically by direct substitution or simplifying expressions. 3. Distinguishing between one-sided and two-sided limits. 4. Identifying infinite limits and discontinuities that can occur with limits involving vertical asymptotes, holes, gaps or jumps in a function's graph. 5. Defining continuity as a function being continuous at a point if it is hole-free, gap-free, and