"String Theory" is a theoretical framework in physics that attempts to reconcile general relativity and quantum mechanics. It posits that the fundamental constituents of the universe are not point-like particles, but rather one-dimensional "strings" that vibrate at different frequencies to manifest as various elementary particles. This theory aims to provide a unified description of all forces and particles in the universe, and it introduces additional dimensions beyond the familiar three spatial and one temporal dimensions of our perceivable world.