According to WikiPedia, Hindi (Devanāgarī: हिन्दी or हिंदी, IAST: Hindī, IPA: [ˈɦɪndiː]) is the name given to various Indo-Aryan languages, dialects, and language registers spoken in northern and central India (the Hindi belt), Pakistan, Fiji, Mauritius, and Suriname. Standard Hindi, a standardized register of Hindustani, is one of the 22 scheduled languages of India and the primary official language of the Indian Union. In the broadest sense of the word, "Hindi" refers to the Hindi languages, a culturally defined part of a dialect continuum that covers the "Hindi belt" of northern India. It includes Bhojpuri, an important language not only of India but, due to 19th and 20th century migrations, of Surinam, Guyana, Trinidad and Mauritius, where it is called Hindi or Hindustani; and Awadhi, a medieval literary standard in India and the Hindi of Fiji. Standard Hindi is the official language of India and is the most widely spoken of India's scheduled languages. It is spoken mainly in northern states of Rajasthan, Delhi, Haryana, Uttarakhand, Uttar Pradesh, Madhya Pradesh, Chhattisgarh, Himachal Pradesh, Jharkhand and Bihar. It is the second major language in Andaman and Nicobar Islands and is also understood in Maharashtra and Gujarat. Hindi is the official language of India. It is also the official languages for 11 states.

Hindi language is mainly written in Devanagari. Devanagari (pronounced /ˌdeɪvəˈnɑːɡəriː/; Hindustani: [d̪eːʋˈnaːɡri]; देवनागरी Devanāgarī) is written from left to right, does not have distinct letter cases, and is recognizable by a horizontal line runs along the top of full letters by joining a word. Devanāgarī is the main script used to write Standard Hindi, Marathi, and Nepali. Since the 19th century, it has been the most commonly used script for Sanskrit. Devanāgarī is also employed for Bhojpuri, Gujari, Pahari (Garhwali and Kumaoni), Konkani, Magahi, Maithili, Marwari, Bhili, Newari, Santhali, Tharu, and sometimes Sindhi, Sherpa and Kashmiri. It was formerly used to write even Gujarati. So the effect of several languages can be seen in the making of Hindi language since it is spoken in large geographic area of India. If we count by combining both first and second language status, this language is being understood by almost 70 percent of the population of India. Apart from Sanskrit and Prakrit, Hindi is very much influenced by Persian. In Hindi, so there is only two gender where Gujarati and Marathi like Sanskrit based languages are still have one neuter gender. Hindi lexicon  has taken a sizable nos of word from Persian and English along with other regional languages and dialects. Now a days the case of code switching and code mixing are also a common phenomena in Hindi.