Quantum State Tomography is a technique used to determine the quantum state of a system. It involves making a series of measurements on a quantum system, such as a qubit, to gather information about its properties. By analyzing the results of these measurements, researchers can reconstruct the quantum state, which is essential for understanding the behavior of quantum systems. This process is crucial in fields like quantum computing and quantum information theory, where knowing the exact state of a quantum system can impact the performance of algorithms and protocols. Quantum State Tomography helps scientists verify and optimize quantum technologies.