Nuristani people in the context of "Landai Sin River"

As of 2025, Afghanistan has an estimated population of around 49.5 million people. The country is characterized by a highly diverse, multi-ethnic, and multilingual society, reflecting its historical position at the crossroads of Central, South, and Western Asia, along ancient trade and invasion routes. The four major ethnic categories in the country are Pashtun, Tajik/Farsiwan, Hazara, and Uzbek. In addition, Afghanistan has a plethora of minor ethnic categories, including Turkmen, Baloch, Aimaq, Nuristani, Arab and many others. Together they make up the contemporary Afghan people.

Approximately 43% of the population was under the age of 15, and about 74% of Afghans lived in rural areas as of 2016. The country has one of the highest fertility rates in the world outside of Africa, with the average woman giving birth to five children over her lifetime. Around 6.8% of infants die during childbirth or early infancy. According to the World Health Organization (WHO), the nation's average life expectancy was estimated at about 63 years as of 2019. The prevalence of HIV remains very low, affecting only about 0.04% of the population.

Afghanistan is a multiethnic country, with its population comprising a variety of social, linguistic, cultural, and tribal communities. The formal categorization of ethnicity in Afghanistan is a relatively recent development, emerging primarily in the 20th century and gaining political significance during the conflicts that began in the 1970s.

Major ethnic categories traditionally identified in Afghanistan include Pashtuns, Tajiks, Hazaras, and Uzbeks. Minor categories include Aimaqs, Turkmens, Balochs, Nuristanis, and Arabs, among others. However, the boundaries between these communities are fluid, with language, self-identification, urban or rural residence, and regional affiliations intersecting in complex ways.

Katë, also known as Kati or Kamkata-vari, is a Nuristani language. It is a dialect continuum comprising three separate dialects spoken mostly in Afghanistan, with additional speakers in the Chitral District of Pakistan deriving from recent migrations a century ago. The Kata-vari (comprising Western and Northeastern) and Kamviri (comprising Southeastern) dialects are sometimes erroneously reckoned as two separate languages, but according to linguist Richard Strand they form one language.

The Katë language is the largest Nuristani language, spoken by 40,000–60,000 people, from the Kata, Kom, Mumo, Kshto and some smaller Black-Robed tribes in parts of Afghanistan and Pakistan. The most used alternative names for the language are Kati or Bashgali.