East Indian languages are a group of languages spoken in the eastern part of India. They include Hindi, Bengali, Marathi, Telugu, and Tamil.

East Indian languages are spoken by approximately 400 million people worldwide.

East Indian languages are characterized by tonal languages, vowel harmony, and retroflex consonants.

Assamese is an example of a tonal language in East India. It has six tones, which are used to distinguish words with different meanings.

Telugu is an example of a vowel harmony language in East India. In Telugu, the vowels in a word must agree in terms of their frontness or backness.

Hindi is an example of a language with retroflex consonants in East India. Retroflex consonants are pronounced with the tongue curled back towards the roof of the mouth.

The Indo-Aryan language family is the major language family in East India. It includes languages such as Hindi, Bengali, Marathi, and Gujarati.

The Dravidian language family is the second major language family in East India. It includes languages such as Telugu, Tamil, Kannada, and Malayalam.

Santali is an example of an Austroasiatic language in East India. It is spoken by approximately 7 million people in India, Bangladesh, and Nepal.

Nepali is an example of a Sino-Tibetan language in East India. It is the official language of Nepal and is also spoken in parts of India, Bhutan, and Sikkim.

Khamti is an example of a Tai-Kadai language in East India. It is spoken by approximately 100,000 people in Arunachal Pradesh, India.

East India faces a number of major sociolinguistic issues, including language endangerment, language discrimination, and language revitalization.

All of the languages listed are endangered languages in East India. They are facing a number of threats, including loss of speakers, lack of education in the language, and discrimination.

All of the languages listed have been imposed on East Indian languages at some point in history. This has led to discrimination against East Indian languages and their speakers.

All of the movements listed are examples of language revitalization efforts in East India. These movements are working to promote the use of East Indian languages in education, media, and government.