Explanation:

Punjabi developed from the ancient language of Sanskrit just like many other modern Indo-Aryan languages.
Punjabi is written in two different scripts, called Gurmukhi and Shahmukhi. Punjabi is the main language spoken by the Sikhs.Most parts of the Guru Granth Sahib use the Punjabi language written in Gurmukhi, though Punjabi is not the only language used in Sikh scriptures. The Janamsakhis, stories on the life and legend of Guru Nanak are early examples of Punjabi literature.

Shahmukhi,meaning literally "from the King's mouth" is a Perso-Arabic alphabet used by Muslims in Punjab to write the Punjabi language. It is generally written in the Nasta'liq calligraphic hand, which is also used for Urdu. Perso-Arabic is one of two scripts used for Punjabi, the other being Gurmukhi.

The Shahmukhi alphabet was first used by the Sufi poets of the Punjab; it became the conventional writing style for the Muslim populace of the Pakistani province of Punjab following the independence of Pakistan in 1947, while the largely Hindu and Sikh modern-day state of Punjab, India adopted the Gurmukhi script to record the Punjabi language.

It is used as the main alphabet to write the Pothohari dialect in Indian Jammu and Kashmir.

Shahmukhi is written from right to left, while Gurmukhi is written from left to right.