Swahili, also known as Kiswahili, is a Bantu language and the first language of the Swahili people. It is a lingua franca of the African Great Lakes region and other parts of eastern and southeastern Africa, including Tanzania, Kenya, Uganda, Rwanda, Burundi, Mozambique and the Democratic Republic of the Congo. The closely related Comorian language, spoken in the Comoros Islands, is sometimes considered a dialect.
Swahili is also one of the working languages of the African Union and officially recognised as a lingua franca of the East African Community. A significant fraction of Swahili vocabulary is derived from Arabic through contact with Arabic-speaking Muslim inhabitants of the Swahili Coast.
Source: https://en.wikipedia.org/wiki/Swahili_language, https://www.one.org/us/2015/06/26/a-dozen-amazing-facts-about-africa-do-you-know-more-than-one/