Title: Pakistan
Content:  More than sixty languages are spoken in Pakistan, including a number of provincial languages. Urdu—the lingua franca and a symbol of Muslim identity and national unity—is the national language and understood by over 75% of Pakistanis. It is the main medium of communication in the country, but the primary language of only 7% of the population. Urdu and English are the official languages of Pakistan. Primarily English is used in official business and government, and in legal contracts; the local variety is known as Pakistani English. Punjabi, the most common language and the first language of 38.78% of the population, is mostly spoken in the Punjab. Saraiki is mainly spoken in South Punjab, and Hindko is predominant in the Hazara region of Khyber Pakhtunkhwa. Pashto is 
Title: Pakistanis
Content:  Urdu is the lingua franca of Pakistan, and while sharing official status with English, it is the preferred and dominant language used for inter-communication between different ethnic groups. Despite serving as the country's national language, Urdu is spoken as a second language by most Pakistanis, with nearly 93% of the population having a mother tongue other than Urdu. Numerous regional and provincial languages are spoken as first languages by Pakistan's various ethnolinguistic groups, with the Punjabi language having a national plurality as the first language of approximately 45% of the total population. Languages with more than a million speakers each include Pashto, Sindhi, Saraiki, Balochi, Brahui and Hindko. The Pakistani dialect of English is also widely spoken throughout the country, albeit mostly in urban centres such as Islamabad and Karachi.
Title: Languages of Pakistan
Content:  Punjabi (پنجابی) is the most widely spoken language in Pakistan. It is spoken as a first language by almost 39% of Pakistanis, mostly in Punjab. It is the 11th most widely spoken language in India, and the third most-spoken native language in the Indian Subcontinent. In Canada, it is the fifth most-spoken native language. It has a significant presence in the United Arab Emirates, the United States, the United Kingdom, Australia, New Zealand, Italy, and the Netherlands. Although Punjabi was the majority language in West Pakistan when Pakistan was created in 1947, and Bengali the majority in East Pakistan and Pakistan as a whole, English and Urdu were chosen as the official languages. The selection of Urdu was due to its association with 
Title: Linguistic rights
Content:  Pakistan uses English (Pakistani English) and Urdu as official languages. Although Urdu serves as the national language and lingua franca and is understood by most of the population, it is natively spoken by only 8% of the population. English is not natively used as a first language, but, for official purposes, about 49% of the population is able to communicate in some form of English. However, major regional languages like Punjabi (spoken by the majority of the population), Sindhi, Pashto, Saraiki, Hindko, Balochi, Brahui and Shina have no official status at the federal level.
Title: Modern language
Content:  In Pakistan, English has the status of an official language and is widely used within the government, by the civil service and the officer ranks of the military. Pakistan's Constitution and laws are written in English. It is also taught extensively in both public and private schools. Studying of English is compulsory in Pakistan along with Urdu (the national language and lingua franca of Pakistan). Regional languages of Pakistan are open to choice and a student is free to either pursue them or not. Nearly all schools, colleges and universities use English as the medium of instruction.
Title: Demographics of Pakistan
Content:  Urdu, or Lashkari (لشکری), is the national language of Pakistan, the lingua franca chosen to facilitate communication between the country's diverse linguistic populations. Although only about 7.5% of Pakistanis speak it as their first language, it is spoken as a second and often third language by nearly all Pakistanis. 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 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 
Title: Languages of Pakistan
Content:  Urdu is the national language, lingua franca and one of two official languages of Pakistan (the other currently being English). Although only about 7% of Pakistanis speak it as their first language, it is widely spoken and understood as a second language by the vast majority of Pakistanis and is being adopted increasingly as a first language by urbanized Pakistanis. It was introduced as the lingua franca upon the capitulation and annexation of Sindh (1843) and Punjab (1849) replacing Persian. It is widely used, both formally and informally, for personal letters as well as public literature, in the literary sphere and in the popular media. It is a required subject of study in all primary and secondary schools. It is the first language of most Muhajirs (Muslim refugees who fled from different parts of India after independence of Pakistan in 1947) and Biharis (coming from East Pakistan around the time of the 1971 Bangladeshi Liberation War), who form nearly 8% of Pakistan's population, and is an acquired second language for the rest. As Pakistan's national language, Urdu has been promoted to promote national unity. It is written with a modified form of the Perso-Arabic alphabet—usually in Nastaliq script.
Title: Languages of Pakistan
Content:  Pakistan has many dozens of languages spoken as first languages. Five languages have more than 10 million speakers each – Punjabi, Pashto, Sindhi, Saraiki and Urdu. Almost all of Pakistan's languages belong to the Indo-Iranian group of the Indo-European language family. Urdu is Pakistan's national language. It is also proposed to be the co-official language along with English. The country also has several regional languages, including Punjabi, Saraiki, Pashto, Sindhi, Balochi, Gujari, Kashmiri, Hindko, Brahui, Shina, Balti, Khowar, Dhatki, Haryanvi, Marwari, Wakhi and Burushaski. Four of these are provincial languages – Punjabi, Pashto, Sindhi and Balochi. Ethnologue lists 74 languages in Pakistan. Of these, 66 are indigenous and 8 are non-indigenous. In terms of their vitality, 6 are classified as 'institutional', 18 are 'developing', 39 are 'vigorous', 9 are 'in trouble', and 2 are 'dying'.
Title: Official language
Content:  Urdu is the national language of Pakistan. Urdu and English both are official languages in Pakistan. Pakistan has more than 60 other languages.
Title: Pakistan
Content:  provincial language of Khyber Pakhtunkhwa. Sindhi is commonly spoken in Sindh, while Balochi is dominant in Balochistan. Brahui, a Dravidian language, is spoken by the Brahui people who live in Balochistan. There are also speakers of Gujarati in Karachi. Marwari, a Rajasthani language, is also spoken in parts of Sindh. Various languages such as Shina, Balti, and Burushaski are spoken in Gilgit-Baltistan, whilst languages such as Pahari, Gojri, and Kashmiri are spoken by many in Azad Kashmir. Arabic is officially recognised by the constitution of Pakistan. It declares in article 31 No. 2 that "The State shall endeavour, as respects the Muslims of Pakistan (a) to make the teaching of the Holy Quran and Islamiat compulsory, to encourage and facilitate the learning of Arabic language ..."

Question: what language do they use in pakistan?
Answer: Seraiki Language.