Question

What is dark matter?​

Answer 1

Non luminous material that is postulated to exist in a space and that could take any of several form including weekly interacting particles .

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Answer 2

Dark matter is a form of hypothetical or theoritical matter which is believed to be the main constituent of 85% of the universe by  scientists and astronomers across the world , since it is matter and so has mass therefore indulges in gravitational activities and it is called "DARK" matter as it doesn't reflect light and so forth isn't visible in any of the radars which use electromagnetic waves for navigation . It is only felt due to its gravitational activity