The Swazi or Swati language ( siswatʼi, isiswaz̤i) is a Bantu language

Bantu languages

The Bantu languages constitute a traditional sub-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...

 of the Nguni group spoken in Swaziland

Swaziland

Swaziland, officially the Kingdom of Swaziland , and sometimes called Ngwane or Swatini, is a landlocked country in Southern Africa, bordered to the north, south and west by South Africa, and to the east by Mozambique...

 and South Africa

South Africa

The Republic of South Africa is a country in southern Africa. Located at the southern tip of Africa, it is divided into nine provinces, with of coastline on the Atlantic and Indian oceans...

 by the Swazi people. The number of speakers is estimated to be in the region of 3 million. The language is taught in Swaziland and some South African schools in Mpumalanga and KaNgwane areas. Swazi is an official language of Swaziland, (along with English), and is also one of the eleven official languages of South Africa.

Although the preferred term is "Swati" among native speakers, in English it is generally referred to as Swazi: this is taken from the Zulu

Zulu language

Zulu is the language of the Zulu people with about 10 million speakers, the vast majority of whom live in South Africa. Zulu is the most widely spoken home language in South Africa as well as being understood by over 50% of the population...

 name for the language, isiSwazi.