In some branches of Indian philosopohy, direct perception from the inner self (mana) together with perception that is filtered through the five senses (pancha indriya) form a part of their valid epistemology (pratyaksha jnana). And this self-realization or self-awareness, is nothing but the knowledge of the "pure being"—the Self.
But more than anything else, meditation is being used as a personal growth device these days—for inculcating a more positive attitude towards life at large.
Meditation is not necessarily a religious practice, but because of its spiritual element it forms an integral part of most religions. And even though the basic objective of most meditation styles remain the same and are performed in a state of inner and outer stillness, they all vary according to the specific religious framework within which they are placed. Preparation, posture, length of period of meditation, particular verbal or visual elements—all contribute to the various forms of meditation. Some of the more popular methods are, Transcendental Meditation, yoga nidra, vipassana and mindfulness meditation.