Here's why:

* Event Horizon Definition: An event horizon is a boundary in spacetime beyond which the gravitational pull is so strong that nothing, not even light, can escape. It's a characteristic of black holes.

* Neutron Star Properties: Neutron stars are incredibly dense, but they are not massive enough to collapse into a singularity and form an event horizon. They are supported by neutron degeneracy pressure, a quantum mechanical effect that prevents further collapse.

* Escape Velocity: While the gravitational pull of a neutron star is extremely strong, it's still less than the speed of light. This means that light and other particles can still escape from the surface of a neutron star.

However, neutron stars do have a surface:

* They have a defined boundary where the dense neutron matter ends.

* This surface is not an event horizon, but it does represent a strong gravitational boundary.

In summary, neutron stars are incredibly dense and possess strong gravity, but they are not black holes. They lack the necessary mass to form an event horizon and thus do not trap light or prevent information from escaping.