+An **open set** in [Topology](/wiki/Topology) is a collection of points where each point has a surrounding space entirely contained within the set. It defines a region without a hard edge, fundamental to understanding [Continuity](/wiki/Continuity) and limits.
+## See also
+- [Closed Set](/wiki/Closed_set)
+- [Metric Space](/wiki/Metric_space)
+- [Neighborhood](/wiki/Neighborhood)