Quantum computers are advanced machines that leverage the principles of quantum mechanics to perform calculations far beyond the capabilities of classical computers. Unlike traditional computers, which use bits (0 or 1), quantum computers use qubits, which can exist in multiple states simultaneously due to superposition. This, combined with entanglement, allows quantum computers to solve complex problems exponentially faster, making them ideal for applications in AI, cryptography, optimization, and material science. While still in early development, quantum computing holds the potential to revolutionize industries and redefine the limits of computational power.