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A function is continuous if there are no breaks, holes, or jumps in its graph. This means you can draw the graph without lifting your pencil.
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Discontinuity: A point where a function is not continuous. This can occur due to holes, jumps, or vertical asymptotes.
Limit: The value that a function approaches as the input approaches some value. Limits are essential for defining continuity.
Asymptote: $y$-values that a graph approaches but never touches or crosses. Vertical asymptotes often indicate discontinuities in rational functions.