General relativity, a fundamental concept developed by Einstein and Minkowski in the early 20th century, revolutionized our understanding of the universe by blending space and time into a unified entity known as space-time. This innovative idea removed the notion of a fixed rest frame and highlighted the maximum speed of light. By recognizing space-time as a dynamic structure with geometric properties, such as curvature, Einstein was able to redefine gravity as the curvature of space-time, thus creating the basis of general relativity.