The Guru Granth Sahib is the Sikhs holy book. Their  holy book is written by  Guru Nanak and other Gurus as well as some Sikhs . The Guru Granth sahib was passed down to Guru to Guru. The holy book is used to guids the Sikhs in their everyday life. Sikh people read the guru Granth sahib  to follow there gurus path which there god had told them to do.

thank you

from Habiba and Tasnim.