The Bantu languages (), technically the Narrow Bantu languages as opposed to "Wide Bantu", a loosely defined categorization which includes other Bantoid languages, constitute a traditional branch of the Niger–Congo languages. There are about 250 Bantu languages by the criterion of mutual intelligibility, though the distinction between language and dialect is often unclear, and "Ethnologue" counts 535 languages. Bantu languages are spoken largely east and south of present-day Cameroon, that is, in the regions commonly known as Central Africa, Southeast Africa, and Southern Africa. Parts of the Bantu area include languages from other language families (see map). 

Estimates of number of speakers of most languages vary widely, due both to the lack of accurate statistics in most developing countries and the difficulty in defining exactly where the boundaries of a language lie, particularly in the presence of a dialect continuum. 

The Bantu language with the largest total number of speakers is Swahili; however, the majority of its speakers know it as a second language. According to Ethnologue, there are over 180 million second-language (L2) speakers, but only about 2 million native speakers. 

Other major languages include Zulu with 27 million speakers (15.7 million L2) and Shona with about 11 million speakers (if Manyika and Ndau are included). Ethnologue separates the largely mutually intelligible Kinyarwanda and Kirundi, which, if grouped together, have 12.4 million speakers.
How many learned Zulu as a second language?
Zulu with 27 million speakers (15.7 million L2