Special relativity - The laws of physics holds true across all frames of reference (FORs) which means that the speed of light in a vacuum (c) is the same for all observers. As a consequence of this reality we are forced to forego the notion of absolute space and time. These constructs will be measured differently by observers based on their specific reference frames making both time and space relative quantities. Additional relativistic effects impact Momentum and the simultaneity of events as viewed from different FORs. Special relativity is a ‘special’ case in that it assumes that all frames of references are themselves not accelerating.
General relativity -Extends Special Relativity into realm of the accelerating FOR and makes the case for gravity being a geometric property of the spacetime background (think of this as the mattress of the universe). Objects with more mass distort spacetime to a greater degree than less massive objects creating more bumps and lumps that influence other objects around them. This manifests itself as the gravity (weight) phenomenon in the classic world.
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