Dharmakaya Talks

The dharmakāya (Sanskrit: धर्म काय, "truth body" or "reality body", Chinese: 法身; pinyin: fǎshēn, Tibetan: ཆོས་སྐུ་, Wylie: chos sku) is one of the three bodies (trikāya) of a Buddha in Mahāyāna Buddhism. The dharmakāya constitutes the unmanifested, "inconceivable" (acintya) aspect of a Buddha out of which Buddhas arise and to which they return after their dissolution. When a Buddha manifests out of the dharmakāya in a physical body of flesh and blood, which is perceptible to ordinary sentient beings, this is called a nirmāṇakāya, "transformation body".

The Dhammakāya tradition of Thailand and the Tathāgatagarbha sūtras of the ancient Indian tradition view the dharmakāya as the ātman (true self) of the Buddha present within all beings.

From Dharmakāya on Wikipedia