How is gravitational lensing related to dark matter and what implications does this relationship have for our understanding of the universe?

Oh, honey, gather 'round and let me tell you something sweet. Gravitational lensing is like putting on glasses to see better - it's used to study dark matter because dark matter doesn't shine like a bright star in the sky! The relationship between them gives us a peek into the invisible stuff that makes up most of the universe, but there's still a lot we don't know, so buckle up for the cosmic rollercoaster ride of understanding!