Punjab
The major language spoken in the Punjab is Punjabi. In the Indian Punjab this is written in the Gurmukhi script. Pakistan uses the Shahmukhi script, that is closer to Urdu script. Hindi, written in the Devanagri script, is used widely in the Indian states of Himanchal Pradesh and Haryana. Several dialects of Punjabi are spoken in the different regions. The Majhi dialect is considered to be textbook Punjabi and is shared by both countries.
Punjabi Language Movement
The Punjabi Language Movement (PLM) is a linguistic movement in Punjab, Pakistan aimed at reviving the Punjabi language, art, culture and literature in Pakistan. The Punjabi people constitute the largest ethnic group in Pakistan though Urdu is the national language and unlike Indian Punjab (where reading/writing Punjabi language is compulsory at every level from 2008 alongside a special Punjabi University at Patiala), Punjabi itself does not have an official status. 
The PLM's ideologies are based on Punjabi nationalism.