Unfortunately, no one can be told what the Matrix is.
You have to see it for yourself.
NEO
How?
MORPHEUS
Hold out your hands.
In Neo's right hand, Morpheus drops a red pill.
MORPHEUS
This is your last chance. After This, there is no going back. In his left, a blue pill.
MORPHEUS
You take the blue pill and the story ends. You wake in your bed and you believe whatever you want to believe.
The pills in his open hands are reflected in the glasses.
MORPHEUS
You take the red pill and you stay in Wonderland and I show you how deep the rabbit-hole goes.
Neo feels the smooth skin of the capsules, with the moisture growing in his palms.
MORPHEUS
Remember that all I am offering is the truth. Nothing more...