+Differentiability describes a function's smoothness, indicating if a [Derivative](/wiki/derivative) exists at each point. A differentiable function is always [Continuous](/wiki/continuous), meaning it lacks sharp corners or breaks, allowing its [Tangent](/wiki/tangent) line to be well-defined everywhere.
+## See also
+- [Calculus](/wiki/calculus)
+- [Limit](/wiki/limit)
+- [Function](/wiki/function)
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