Even though it's been explained, im going to waste my time and do it again

Keif is made up of small crystalls. These crystalls are trichomes. The cannabis plant stores it's highest concentrations of THC CBN CBD CBG in the trichomes. They are the most potent part of the plant. The plant matter itself DOES contain THC, but in such small amount it'd be almost unnoticeable with trichomes.

The trichomes grow and look like mushrooms. Inside the trichome it is oil. The oil contains the phycoactive chemicals.

When the plant is dried these oil filled trichomes crystalise. When cured, more THC is activated.

Kief is what gets you stoned.

Also, when warmed and compressed, it is what makes hash.

It's the cannabis plants resin.