Niger-Congo
The Niger-Congo language family is Africa's largest language family by number of languages (approximately 1,500–2,000) and by number of speakers (around 700 million), and one of the world's largest language families overall. It encompasses most of the languages of sub-Saharan Africa, including the Bantu languages (spoken across the southern two-thirds of the continent), the Volta-Niger languages of West Africa (including Yoruba and Igbo), the Atlantic languages (including Wolof and Fula), and many others.
The family's deepest relationships remain contested. Some linguists treat Niger-Congo as a valid genetic unit; others, most notably John Williamson, have argued that the supposed family is a convenience grouping of African languages that share some features but may not all descend from a single ancestor. The Bantu subgroup — which alone contains around 500 languages and is spoken by approximately 350 million people across Central, Eastern, and Southern Africa — is uncontroversially a coherent genetic unit, with a well-reconstructed common ancestor (Proto-Bantu) and a clear homeland in the Nigeria-Cameroon border area.
The Bantu expansion is one of the most significant demographic and linguistic events of the past 5,000 years. Beginning around 3000 BCE, Bantu-speaking farmers — equipped with iron tools, cattle, and cultivated sorghum and millet — spread southward and eastward from the Nigeria-Cameroon border region. Ancient DNA from East and Southern Africa confirms that this expansion involved substantial population movement: pre-Bantu hunter-gatherer populations (related to the Khoisan and forest-dwelling groups) were largely replaced or absorbed. The expansion reached southern Africa by approximately 300–500 CE and fundamentally transformed the genetic, cultural, and linguistic landscape of the continent's southern half.
The Fula (Fulani) people, speakers of a Niger-Congo language (Fula belongs to the Atlantic branch), represent a distinct case: a predominantly pastoral people who spread across the Sahel from West Africa to East Africa over the past millennium, carrying their language as a trade and pastoral network language rather than as the language of farming colonisers. Yoruba and Igbo, spoken by approximately 40 million and 30 million people respectively in Nigeria, are among Africa's most numerically significant languages and have been carried to the Caribbean and Americas through the transatlantic slave trade.