The Many-Worlds Interpretation (MWI) of quantum mechanics is a theoretical framework that suggests every quantum event results in the branching of the universe into multiple, parallel worlds or realities. This interpretation was formulated by physicist Hugh Everett III in 1957. In classical quantum mechanics, when a measurement is made, the wave function—an equation describing the quantum state of a system—collapses into a single outcome.
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An interpretation retaining universal unitary evolution of the quantum state, with definite measurement records described relative to outcome branches. Quantum decoherence explains the practical isolation and stable record basis of emergent branches. It does not insert a physical collapse selecting just one component. The emergence of branch structure and justification of Born rule weights involve additional interpretive arguments beyond writing the Schrödinger equation.
One single universal wavefunction, and every possible outcomes happens in some alternate universe. Does feel a bit sad and superfluous, but also does give some sense to perceived "wave function collapse".