Ok, so imagine you have two toys: a ball and a doll. Now, you know that the ball is different from the doll, right? They look different, they feel different, and they do different things. Well, in dvaita literature, people believe that this is true for everything in the world - everything is different and separate from everything else.
But why do they believe this? Well, it goes back to a man named Madhvacharya, who lived a really long time ago in India. He thought that there were three kinds of things in the world: God, souls, and matter. God is the most important thing, because he made everything else. Souls are like little bits of God that live inside people and animals. And matter is everything else in the world - like the ball and the doll.
Now, Madhvacharya believed that God was completely separate from everything else in the world. It's like he's up in the clouds, looking down on everything else. And because God is separate from everything else, that means that everything else is separate from each other too. So, according to dvaita literature, the ball is not the same as the doll, and animals are not the same as people.
Some people like dvaita literature because it makes them feel like everything in the world is special and unique. But other people don't like it because they think it might make people feel like they're better or more important than other things in the world. As you can see, there are different opinions and beliefs about dvaita literature, but it's important to respect and understand all of them.