String theory is a theoretical framework in physics that suggests that the fundamental particles of the universe are not point-like dots, but rather tiny, vibrating strings. These strings can vibrate at different frequencies, which determine the properties of the particles they represent, such as mass and charge. The theory aims to reconcile quantum mechanics and general relativity, providing a unified description of gravity and particle physics. It also proposes additional dimensions beyond the familiar three dimensions of space and one of time. Overall, string theory seeks to explain the fundamental nature of the universe in a comprehensive way.