A quantum computer is an innovative computing device that uses qubits as the basic units of information storage and processing, enabling operations using quantum mechanical principles such as superposition and quantum entanglement. These principles allow quantum computers to perform complex calculations that would take a disproportionate amount of time for conventional computers, especially in solving problems such as cryptography, molecular structure modeling, and optimization. The development of quantum computers opens up new possibilities in science and technology, but they are still in the early stages of development and face challenges related to their stability and scalability.