In simple words Meditation or Dhyana is the form of self enquiry, to search for an answer for our birth. Relationship between the eternal truth and existence. There is no specific prescribed method for meditation. Sage of Tiruvannamalai devised his own method of self enquiry, by simply asking the question "who am I". Of course each one of them will give different method adopted by them. This enquiry is going on since ages, by followers of different Religions.
Brahmanyan,
Bangalore