👉 Obrestriction, also known as the "obstruction of the second degree," is a type of restriction in algebraic geometry. It is closely related to the theory of reduced curves and can be thought of as a generalization of the concept of an obstruction to a divisor on a curve. In the context of algebraic geometry, obstructions are used to classify certain types of divisors that appear in algebraic varieties. They are analogous to the notion of an obstruction to a divisor on a curve,