The Cosmic Horizon refers to the maximum distance from which light has had time to reach an observer since the beginning of the universe. This boundary defines the observable universe, beyond which we cannot see because the light from those regions has not yet reached us. The Cosmic Horizon is a result of the finite speed of light and the age of the universe, estimated to be about 13.8 billion years. As the universe expands, the Cosmic Horizon also changes. Objects that are currently beyond this horizon may eventually come into view as the universe continues to evolve. This concept is crucial for understanding the structure and evolution of the universe, as well as the implications of theories like the Big Bang and cosmic inflation.