How to speak in Hindi - Numbers, Days of the Week, Months of the Year and Greetings
Standard Hindi, or more precisely Modern Hindi, also known as Manak (meaning standard) Hindi (Devanagari: मानक हिन्दी), High Hindi, Nagari Hindi, and Literary Hindi, is a standardised and sanskritised register of the Hindi-Urdu language derived from the Khariboli dialect of Delhi and Western Uttar Pradesh. It is an official language of the Republic of India.
Colloquial Standard Hindi is mutually intelligible with another register of Hindi-Urdu language called Urdu. Mutual intelligibility decreases in literary and specialized contexts which rely on educated vocabulary. Due to religious nationalism and communal tensions, speakers of both Hindi and Urdu frequently assert that they are distinct languages, despite the fact that native speakers generally cannot tell the colloquial languages apart. The combined population of Hindi-Urdu speakers is the fourth largest in the world. However, the number of native speakers of Standard Hindi is unclear. According to the 2001 Indian census, 258 million people in India reported their native language to be "Hindi". However, this includes large numbers of speakers of Hindi dialects besides Standard Hindi; as of 2009, the best figure Ethnologue could find for Khariboli Hindi was a 1991 citation of 180 million.
Source: Wikipedia