Hindustani language

Hindustani is an Indo-Aryan language.https://dn721609.ca.archive.org/0/items/forumias.com-explained-why-lashkari-is-an-indian-language-not-a-foreign-one/forumias.com-Explained%20Why%20Lashkari%20is%20an%20Indian%20language%20not%20a%20foreign%20one.pdf It is widely spoken in India and Pakistan. It is written in Devanagari and Nastaliq. The Devanagari variety is commonly called Hindi or Hindui. The Nastaliq variety is commonly called Urdu or Lashkari.Although Urdu in form of Zuban-I Urdu-yi Mu'lla was already in use during the reign of Emperor Shajahan and referred to as Lashkari Zaban, Muhammed Shah made it popular among his people, declaring it to be his Court Language. In his respect, Lashkari or Urdu replaced Farsi or Persian, which was being used and understood by fewer and fewer individuals. Dhir, K. S. (2022). The Wonder that is Urdu: A Multidisciplinary Analysis. India: Motilal Banarsidass There also is a Braille version, called Bharati Braille.

Because the English languge is important in the region, the Hindustani language is sometimes written using the Latin script. These transliterations are called Romainzed Urdu, and Roman Hindi. 

Hindi and Urdu use different alphabets, but the grammar and pronounciation is almost the same. For this reason, the languages are mutually intelligible. Two peole will understand each other, when one of them speaks Urdu, and the other Hindi. As both languages use different writing systems, this may not be the case for written texts. 
References

Other websites
History of Hindustani  JustPedia

Category:Indo-Aryan languages
Category:Languages of India
Category:State symbols of Himachal Pradesh
Category:Languages of Pakistan
Category:Hindi
Category:Urdu language