Classical Pantheism is the idea that everything in the universe is connected and part of the same thing. It's like a giant jigsaw puzzle where all the pieces are connected, and when you put them all together it creates one big picture. This big picture is the universe, and it is all connected. Everything in it, from animals, plants, planets and stars, to people and things, is all part of the same thing. The universe is one big, unified whole and is connected in many ways.
This idea of pantheism, or the unity of all things, has been around for thousands of years. Some people believe in it, and some don't. It's up to you to decide if you think it's true or not.