Standard (Suddha) Hindi vs Hindustani:-
Hindustani, commonly known as Hindi-Urdu and historically as Hindavi, Urdu, and, is the lingua franca of north india and Pakistan. It is an indo Aryan language and it is deriving primarily from the khariboli of Delhi, and borrows a large amount of vocabulary from Persian, Arabic, Sanskrit and Turkic. The colloquial languages are all but indistinguishable, and even though the official standards are nearly identical in grammar. They differ in literary conventions and in academic and technical vocabulary. With Urdu retaining stronger Persian, Central Asian and Arabic influences, and Hindi relying more heavily on Sanskrit. Before the partisan of India, the terms Hindustani, Urdu, and Hindi were synonymous; all covered what would be called Urdu and Hindi today.
The term Hindustani is still used for the colloquial language and lingua franca of North India and Pakistan, for example for the language of bollywood films, as well as for several quite different varieties of Hindi spoken outside the Subcontinent, such as Fiji Hindi and the Caribbean Hindustani of Suriname and Trinidad.
Standard Hindi, the official language of India, is based on the khariboli dialect of the Delhi region and differs from Urdu in that it is usually written in the indigenous devnagari script of India and exhibits less Persian influence than Urdu. Many scholars today employ a Sanskritized form of Hindi developed primarily varansi, the Hindu holy city, which is based on the Eastern Hindi dialect of that region and thus a separate language from official Standard Hindi. It has a literature of 500 years, with prose, poetry, religion & philosophy, under the Bahmani Kings and later on Khutab Shahi Adil Shahi etc. It is a living language, still prevalent all over the Deccan Plato. Note that the term "Hindustani" has generally fallen out of common usage in modern India, except to refer to a style of Indian Hindustani