Two types of matter

Baryonic

All the normal matter in the universe. Accounts for 4% of all matter

Nonbaryonic

Missing matter? Accounts for 26% critical density in universe.

-cold dark matter

In the case of the dark matter known as "hot", the particles have speeds close to light.

while the particles of black matter known as "cold" would be more massive and thus slower.

-hot dark matter