Explain what is dark matter?

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Dark matter is an invisible matter in the space that can hold the stars into the galaxy. They have no effect of electromagnetic force on it, which means it does absorb, reflect or emit light that makes them practically invisible.

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According to my knowledge dark matter is which absorbs all light rays and does not emit it .
There is nothing completely dark .
Not a black hole too .
( I am not sure about my answer . )

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