Limits and colimits in an ∞-category
In mathematics, especially category theory, limits and colimits in an ∞-category generalize limits and colimits in a category. Like the counterparts in ordinary category theory, they play fundamental roles in constructions (e.g., Kan extensions) as well as characterizations (e.g., sheaf conditions) in higher category theory.
Source: Wikipedia — Limits and colimits in an ∞-category (CC BY-SA 4.0)