Khyber Pakhtunkhwa (abbreviated as KP or KPK; undefined; خیبر پښتونخوا) is one of the four administrative provinces of Pakistan, located in the northwestern region of the country along the international border with Afghanistan. It was previously known as the North-West Frontier Province (NWFP) until 2010 when the name was changed to Khyber Pakhtunkhwa by the 18th Amendment to Pakistan's Constitution, and is known colloquially by various other names. Khyber Pakhtunkhwa is the third-largest province of Pakistan by the size of both population and economy, though it is geographically the smallest of four. Within Pakistan, Khyber Pakhtunkhwa shares a border with Punjab, Balochistan, Azad Kashmir, Gilgit-Baltistan, and Islamabad. It comprises 10.5% of Pakistan's economy, and is home to 17.9% of Pakistan's total population, with the majority of the province's inhabitants being Pashtuns. The province is the site of the ancient kingdom Gandhara, including the ruins of its capital Pushkalavati near modern-day Charsadda. Originally a stronghold of Buddhism, the history of the region was characterized by frequent invasions under various Empires due to its geographical proximity to the Khyber Pass.
Since the 9/11 attacks in the United States in 2001, the Khyber Pakhtunkhwa has been a major theatre of militancy and terrorism which intensified when the Taliban began an unsuccessful attempt to seize the control of the province in 2004. With the launch of Operation Zarb-e-Azb against the Taliban insurgency, the casualty and crime rates in the country as a whole dropped by 40.0% as compared to 2011–13, with even greater drops noted in Khyber Pakhtunkhwa and the Federally Administered Tribal Areas. As of July 2014, about 929,859 people were reported to be internally displaced from North Waziristan to Khyber Pakhtunkhwa as a result of Operation Zarb-e-Azb.
On March 2, 2017, the Government of Pakistan considered a proposal to merge the Federally Administered Tribal Areas with Khyber Pakhtunkhwa, and to repeal the Frontier Crimes Regulations, which are currently applicable to the tribal areas. However, some political parties have opposed the merger, and called for the tribal areas to instead become a separate province of Pakistan. On 24 May 2018, the National Assembly of Pakistan voted in favour of an amendment to the Constitution of Pakistan to merge the Federally Administered Tribal Areas with Khyber Pakhtunkhwa province. The Khyber Pakhtunkhwa Assembly then approved the historic FATA-KP merger bill on 28 May 2018 making FATA officially part of Khyber Pakhtunkhwa, which was then signed by President Mamnoon Hussain, completing the process of this historic merger.