What is space?

Space is the opposite of matter and a fundamental entity without which matter can not exist . One can not tell the existence of space unless matter exists. Matter and space exist in relativity, the same way  the motion of an  object   relative is  to another.
Matter needs space to display its properties. Imagine matter without space. Can it move? No. Can it have dimension? No.
Matter and space do not only need each other to exist but also exist in certain proportion to each other. That is, for certain amount of matter there is certain volume of space. The destruction of certain amount of matter will destroy certain volume of space resulting in energy. Energy in turn can create space and matter (Big bang).

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