Hindi is the name given to an Indo-Aryan language, or a dialect continuum of languages, spoken in northern and central India (the "Hindi belt"), It is the national language of India. The native speakers of Hindi dialects between them account for 40% of the Indian population (1991 Indian census). Standard Hindi is one of the 22 official languages of India, and is used, along with English, for administration of the central government. Standard Hindi is a Sanskritized register derived from the khari boli dialect. Urdu is a different, Persianized, register of the same dialect. Taken together, these registers are historically also known as Hindustani. The word Hind? is of Persian origin and literally means "Indian", comprising Hind "India", and the adjectival suffix -?. The word was originally used by Muslims in north India to refer to any Indian language: for example the eleventh-century writer Ab? Rayh?n al-B?r?n? used it to refer to Sanskrit. By the 13th century, "Hindi", along with its variant forms "Hindavi" and "Hindui", had acquired a more specific meaning: the "linguistically mixed speech of Delhi, which came into wide use across north India and incorporated a component of Persian vocabulary". It was later used by members of the Mughal court to distinguish the local vernacular of the Delhi region where the court was located from Persian, which was the official language of the court. Evidence from the 17th century indicates that the language then called "Hindi" existed in two differing styles: among Muslims it was liable to contain a larger component of Persian-derived words and would be written down in a script derived from Persian, while among Hindus it used a vocabulary more influenced by Sanskrit and was written in Devanagari script. These styles eventually developed into modern Urdu and modern Hindi respectively. However the word "Urdu" was not used until around 1780: before then the word "Hindi" could be used for both purposes. The use of "Hindi" to designate what would now be called "Urdu" continued as late as the early twentieth century. Nowadays Hind? as taken to mean "Indian" is chiefly obsolete; it has come to specifically refer to the language(s) bearing that name.

Esperanto is the most widely spoken artificial language. The name derives from Doktoro Esperanto, the pseudonym under which L. L. Zamenhof published the first book of Esperanto, the Unua Libro, in 1887. The word esperanto means 'one who hopes'. Zamenhof's goal was to create an easy and flexible language that would serve as a universal second language to foster peace and international understanding. Esperanto has a very regular structure. Words are often made from many other roots, and in this way the number of words which one must memorise is made much smaller. The language is phonetic, and the rules of pronunciation are very simple, so that everyone knows how to pronounce a written worde and vice-versa.Esperanto has had continuous usage by a community estimated at between 100,000 and 2 million speakers for over a century. By most estimates, there are approximately a thousand native speakers. No country has adopted the language officially. Today, Esperanto is employed in world travel, correspondence, cultural exchange, conventions, literature, language instruction, television (Internacia Televido), and radio broadcasting. Esperanto is also a language of internet websites, which can be explored from the Esperanto interface of Google Search.