Nondualism is a way of thinking that believes that all things in the universe are connected, and that everything is part of the same "oneness". In other words, it's the idea that nothing and nobody can be separated from anything else - that we are all part of the same "big picture". It's like one big puzzle with all the pieces connected. Nondualism also suggests that we are all connected to a greater power, or "source", and that the source is the ultimate truth.