Punjabis
The main language of the Punjabi people is Punjabi and its associated dialects, which differ depending on the region of Punjab the speaker is from; there are notable differences in the Lahnda languages, spoken in the Pakistani Punjab. In the Pakistani Punjab, the vast majority still speak Punjabi, even though the language has no governmental support. In the Indian Punjab, most people speak Punjabi. English is sometimes used, and older people who lived in the undivided Punjab may be able to speak and write in Urdu. The Punjabi languages have always absorbed numerous loanwords from surrounding areas and provinces (and from English).
Demographics of Pakistan
On the annexation of Sindh (1843) and Punjab (1849), the British Raj encouraged its use as the "lingua franca" and subsequently banned the use of Persian, which had been the "lingua franca" of the region for many centuries before. Persian had been introduced by Central Asian Turkic invaders who migrated into South Asia, and had been patronised by the Turko-Afghan Delhi Sultanate. This language change was designed to institute a universal language throughout the then British Raj in South Asia as well as minimize the influence that Persia, the Ottoman Empire and Afghanistan had on this transitional region.