A Rubik's Cube is a 3D combination puzzle invented in 1974 by Hungarian architect Ernő Rubik. It consists of a cube made up of smaller colored squares on each face, with the goal of twisting and turning the sections to align all colors on each side. The standard cube has six faces, each with a different color, and can be scrambled into millions of combinations. Solving the cube requires understanding algorithms and patterns, making it a popular challenge for puzzle enthusiasts and a tool for developing problem-solving skills.