The Kiswahili language, originally from the coast of the same name that goes from the north of Mozambique to the Horn of Africa and later adopted also by the rest of East Africa, particularly by the peoples that overlook the great African lakes, is confirmed as the most widely spoken language on the continent.
A recent research by four English and American universities pays great importance to Kiswahili, which today is spoken by over 120 million people, divided between Kenya, Tanzania, Uganda, Rwanda, Burundi, southern Somalia, and some areas of the Democratic Republic of Congo, Mozambique, the Comoros Islands and South Sudan. Not to mention all the native Kiswahili speakers around the world.
Kiswahili is a Bantu language believed to have originated from other languages, mainly Arabic, due to historical interactions between Middle Eastern Arabs and East Africans. To greet in Swahili, one says "Jambo", or "Habari" when greeting an elder.
The second on our list is Swahili, known as Kiswahili in the language itself.
Swahili is a Bantu language widely spoken in the African Great Lakes region, which includes a huge belt of Central, Southern and Eastern Africa. There is also a large number of Swahili speakers in countries adjacent to the Great Lakes region.
Throughout Africa only Arabic is more widely spoken, as a national language, but it is not a language that originates in the Black Continent.
Kiswahili means "language of the coast", and it is a commercial language that was created to facilitate communication between a number of ethnic groups in southern and eastern Africa.
For us Italians, Kiswahili is one of the least difficult languages to learn, because vowels are pronounced as they are written and can be spoken and understood even in a simplified way.

Translated with www.DeepL.com/Translator (free version)