Sikhism: a brief history.

 Sikhism or Sikhi (Punjabi: ਸਿੱਖੀ Sikkhī, [ˈsɪkːʰiː], from ਸਿੱਖ, Sikh, 'disciple', 'seeker', or 'learner') is an Indian Dharmic religion that originated in the Punjab region of the Indian subcontinent around the end of the 15th century CE. Sikhism is one of the youngest of the major religions and the world's fifth-largest organized religion, with about 25–30 million Sikhs as of the early 21st century . However, according to rough estimates, there are around 120–150 million (12–15 crore) Sahajdhari or non-khalsa Nanakpanthi sikhs across the world who also believe in 10 Sikh Gurus and Guru Granth Sahib.

Sikhism developed from the spiritual teachings of Guru Nanak, the first Guru (1469–1539), and of the nine Sikh gurus who succeeded him. The tenth guru, Gobind Singh (1666–1708), named the Sikh scripture Guru Granth Sahib as his successor, bringing to a close the line of human gurus and establishing the scripture as the last eternal 11th living guru, a religious spiritual/life guide for Sikhs. Guru Nanak taught that living an "active, creative, and practical life" of "truthfulness, fidelity, self-control and purity" is above metaphysical truth, and that the ideal man "establishes union with God, knows His Will, and carries out that Will". Guru Hargobind, the sixth Sikh Guru (1606–1644), established the concept of mutual co-existence of the miri ('political'/'temporal') and piri ('spiritual') realms.

The Sikh scripture opens with the Mul Mantar (ਮੂਲ ਮੰਤਰ), fundamental prayer about ik onkar (ੴ, 'One God'). The core beliefs of Sikhism, articulated in the Guru Granth Sahib, include faith and meditation on the name of the one creator; divine unity and equality of all humankind; engaging in seva ('selfless service'); striving for justice for the benefit and prosperity of all; and honest conduct and livelihood while living a householder's life. Following this standard, Sikhism rejects claims that any particular religious tradition has a monopoly on Absolute Truth.

Sikhism emphasizes simran (ਸਿਮਰਨ, meditation and remembrance of the teachings of Gurus), which can be expressed musically through kirtan, or internally through naam japna ('meditation on His name') as a means to feel God's presence. It teaches followers to transform the "Five Thieves" (i.e. lust, rage, greed, attachment, and ego).

The religion developed and evolved in times of religious persecution, gaining converts from both Hinduism and Islam. Mughal rulers of India tortured and executed two of the Sikh gurus—Guru Arjan (1563–1605) and Guru Tegh Bahadur (1621–1675)—after they refused to convert to Islam. The persecution of Sikhs triggered the founding of the Khalsa by Guru Gobind Singh in 1699 as an order to protect the freedom of conscience and religion, with members expressing the qualities of a Sant-Sipāhī ('saint-soldier').