Its been said that deep meditationl leads a meditator to another world, what is this another world actually? I have heard that when a meditator does a long meditation, he is able to enter into different world, see and hear that world. What are those? Are they just illusion, imagination or different universe?
What is called world in Buddhism is the six senses. When you meditate you experience finer senses which you can't experience via ear, nose etc. When you meditate you experience finer wholesome mental states.
The logic here is for example you can see only colours from your eye. Even if you become a Deva or Brahama with your eye you only see colours.