Quantum superposition is a term used to describe the state of a quantum system when it is in multiple states simultaneously. Synonyms for this term include quantum entanglement, quantum indeterminacy, and quantum coherence. These terms all refer to the strange and counterintuitive nature of quantum mechanics, where particles can exist in multiple states at the same time, and their properties can be linked to the properties of other particles, even if they are separated by vast distances. Understanding these concepts is essential for developing new technologies based on quantum mechanics, such as quantum computers and quantum communication systems.