The terms 'Event Horizon', 'Singularity', 'String Theory' and 'Standard Model' are associated with the observation and understanding of the Universe, particularly in the field of cosmology and astrophysics.

Event Horizon refers to the boundary around a black hole, beyond which nothing, not even light, can escape the black hole's gravitational pull.

Singularity refers to a point in spacetime where the gravitational field becomes infinite, such as at the center of a black hole, where the laws of physics as we know them break down.

String Theory is a theoretical framework in particle physics that attempts to unify all the fundamental forces of nature, including gravity, into a single coherent model.

Standard Model is the most comprehensive and well-tested theory in particle physics, which describes the fundamental particles and their interactions, except for gravity.