The Khoisan language family is the smallest of the languages families of Africa.
The language is used at all levels of education and in the media.
Many of the Khoisan languages have five vowels /i/, /e/, /a/, /o/, /u/ which can be produced with additional features, such as nasalization, pharyngealization, and different voice qualities such as breathy and creaky voice, sometimes resulting in up to 40 different vowels.
Among home languages Yeyi is the main language of the north-west, Subiya of the far north, Kalanga of the north-east, Birwa/Tswapong of the far east- central, and Tswana of central and south-eastern Botswana.
The official language is English, used for all government correspondence and as the medium of instruction from post-elementary primary education upwards.
Languages of Botswana has fascinating details and (conjectured or guesstimated) statistics of numbers of speakers of languages.