Punjab could be mainly in Pakistan at this moment, but the Punjabi people live and have resided in India also. As disputes emerged between the Indians and Pakistani, the border has moved from one area to another. Still, the Punjabi society is probably a vital aspect of India's history.
Punjab is a geopolitical, cultural, and historic area in South Asia, situated in the northern area of the Indian subcontinent and incorporating parts of Pakistan and India. The area's limitations are ill-defined and based upon historic accounts.
With time, the geographical definition of the name "Punjab" has moved. It described a really minimal terrain between the Indus and the Sutlej rivers at the time of the Mughal Empire's 16th century reign.
So, if this is your cup of tea, I invite you to get started with this book. You will learn about this interesting people, who value their religion and their traditions more than anything, and who stick to old habits despite of technological advances.