Bahá'í literature, like much religious text, covers a variety of topics and forms, including scripture and inspiration, interpretation, history and biography, introduction and study materials, and apologia. Sometimes considerable overlap can be observed in a particular text.
The "canonical texts" are the writings of the Báb, Bahá'u'lláh, `Abdu'l-Bahá, Shoghi Effendi and the Universal House of Justice, and the authenticated talks of `Abdu'l-Bahá. The writings of the Báb and Bahá'u'lláh are considered as divine revelation, the writings and talks of `Abdu'l-Bahá and the writings of Shoghi Effendi as authoritative interpretation, and those of the Universal House of Justice as authoritative legislation and elucidation. Some measure of divine guidance is assumed for all of these texts.
The Bahá'í Faith relies extensively on its literature. Literacy is strongly encouraged so that believers may read the texts for themselves. In addition, doctrinal questions are routinely addressed by returning to primary works.
Much of the early works of the religion were in the form of letters to individuals or communities. These are termed tablets and have been collected into various folios by Bahá'ís over time. Today, the Universal House of Justice still uses letters as a primary method of communication.
Generally speaking, the literary form of a particular book can generally be observed by noting the author and/or title.
Bahá'ís believe that the founders of the religion, The Báb and Bahá'u'lláh, received revelation directly from God. As such their works are considered divinely inspired. These works are considered to be "revealed text" or revelation.