Meditation is the art to contact our-self with the supreme. And during this contact, we experience our unification with the God, the supreme of the existence. When the all thoughts disappear, there is no concept within us, we being only one entity with the God. Then there is no fraction, no duality, we remain simply under the boon of that supreme. This is a heart to heart to heart communication beyond the all conditioning of life.
In such moments the sadhak feel something transcendent, beyond this world, utterly cosmic, calm and energetic. This is the meditation. But as the colors can not be described to the blind, it can not be described, it can be merely our practical experience. There are various approaches of the meditation . The sadhak can choose any one, or do their own variation as these act more as guidelines