String Field Theory is a theoretical framework in physics that extends the principles of string theory. In string theory, the fundamental building blocks of the universe are one-dimensional strings rather than point-like particles. String Field Theory aims to describe these strings in a more comprehensive way, allowing for interactions and dynamics in a field-like manner. This approach combines elements of quantum field theory with string theory, providing a way to study the behavior of strings in various contexts. It seeks to unify different string theories and offers insights into the nature of gravity, quantum mechanics, and the fundamental forces of the universe.