Satori is a word that originates from Japan. It literally translates as 'awakening' and is used to describe a moment of 'sudden enlightenment'.
To attempt to understand this as an experience, try this:

Imagine your mind as being a glass prism situated behind your eyes.. It breaks up reality in a similar way to how a glass prism refracts light.

What goes in is pure and whole, but what comes out is broken and fractured. When the mind is active, what is received by the eyes is broken up into tiny little manageable pieces of information. Then for convenience, it will discard anything that it considers to be irrelevant, or 'not fitting' [what you already believe to be true].. Then your body will react according to that particular interpretation of reality. That's not to say the mind is bad or wrong, only that the mind does not see Truth, but only what it allows to be true..

When the mind falls silent the prism is removed, and you become just like a mirror. Light goes in through the eyes and your being will directly reflect what is being received.

See if you can catch the next time your mind goes silent. Be aware of the stillness it brings. Notice that the mind will want to judge it or describe it. If thoughts come, acknowledge them and let them be on their way. Just watch them. Treat them in a manner similar to watching clouds float through the sky. Stay with this feeling and remember it well.

For in that moment, all will be revealed.