Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In Vajrayana Buddhism, an Ishta-deva or Ishta-devata (Yidam in Tibetan) is a fully enlightened being who is the focus of personal meditation, during a retreat or for life. The term is often translated into English as tutelary deity, meditation deity, or meditational deity. The Ishta-deva appears in the 'Inner' refuge formula of the Three Roots and is also the key element of Deity Yoga since the 'deity' in the yoga is the Ishta-deva. The Sanskrit word iá¹£á¹adevatÄ or iá¹£á¹adevaá¸¥ is a compound of iá¹£á¹a (desired, liked, reverenced) + devatÄ (a deity or divine being). It is defined by V. S. Apte as a favorite god, one's tutelary deity." Though this term is used in many popular books on Buddhist Tantra, the term iÅŸÅ£adevatÄ has not been attested in any Buddhist tantric text in Sanskrit. The word corresponding to this concept is adhideva, though of rare occurrence. The unrelated Tibetan version of the term, possibly of entirely native origin, is yi-dam is said to be a contraction of Tib. yid-kyi-dam-tshig, meaning "samaya of mind"- in other words, the state of being indestructibly bonded with the inherently pure and liberated nature of mind."