Quantum mechanics, which arose from the necessity to describe events beyond classical physics, entails the quantization of energy and wave particle duality, which are fundamental notions introduced by Planck, Einstein, and de Broglie. Heisenberg's Uncertainty Principle and Schrödinger's wavefunction formalism define quantum systems' probabilistic nature. Quantum field theory (QFT) applies these ideas to fields, characterizing particles as excitations within them, which is critical for understanding forces in the Standard Model of particle physics. Quantum computing, which takes advantage of qubits' superposition and entanglement, promises solutions to problems that classical computers cannot solve, including quantum error correction and encryption to ensure safe communication. Experimental developments such as Bose-Einstein condensates and quantum dots allow for precise control and observation of quantum systems.