Guru Granth Sahib is a Granth (book) originally compiled by the Fifth Guru and named as Adi Granth, and later recompiled by all the gurus that followed him. Guru Granth Sahib was appointed as the Eleventh Guru by Tenth Guru, Guru Gobind Singh. It is the ultimate teacher of the Sikhs. More detailed information can be found at http://www.sgpc.net/sikhism/guru-granth-sahib.html.
(Punjabi) In Sikhism: The principal scripture containing devotional compositions written by the Sikh gurus and recorded during their lifetimes. It also contains hymns by Hindu and Muslims. Written in Sanskrit, Persian, Hindi and Punjabi, the compositions are set in rhymed couplets. It is printed in Gurmukhi script, an alphabet adapted by the second guru, Guru Angad, for the Punjabi language. It has standardized pagination, all copies having 1,430 pages. When closed it is wrapped in an elegant cloth ( rumal). It is opened only under a canopy ( chanani) and is then protected with a ceremonial flywhisk ( chauri).
The Aadh Granth, the sacred scriptures of the Sikhs.
the ever-living Guru and last of the lineage of Gurus. This Sikh holy book is a collection of the writings and scripture of the Gurus, gathered together in 1604 by the fifth human Guru, Guru Arjan, and published by the last Guru, Guru Gobind Singh (with a few additions). It lays out the way of life for a Sikh.
The holy scripture of the Sikhs (Also, Sri Guru Granth Sahib)
The Sikh scripture, written in poetry organized in 31 sections, with each section corresponding to a particular melodic scale, or raag. It includes the poetry of six Sikh Gurus, and 36 other saints, including Muslims and Hindus. It is 1430 pages long and is the embodiment of the spiritual knowledge and authority of all of the Gurus. The words from the Guru Granth Sahib are the central focus at all Sikh Gurdwaras. It is used by Sikhs for meditation, guidance, comfort, and inspiration.
The Guru Granth Sahib (, ) — Granth is Punjabi for book; Sahib is Hindi meaning master, from Arabic, meaning companion, friend, owner, or master. It is the Guru of the Sikhs. Guru Granth Sahib Ji is the living Guru of the Sikhs.