Efik ˈɛfɪk (Usem Efịk) is the indigenous language of the Efik people, who are situated in the present-day Cross River state and Akwa Ibom state of Nigeria, as well as in the North-West of Cameroon. The Efik language is mutually intelligible with other lower Cross River languages such as Ibibio, Annang, Oro and Ekid but the degree of intelligibility in the case of Oro and Ekid is unidirectional; in other words, speakers of these languages speak and understand Efik (and Ibibio) but not vice versa. The Efik vocabulary has been enriched and influenced by external contact with the British, Portuguese and other surrounding communities such as Balondo, Oron, Efut, Okoyong, Efiat and Ekoi (Qua).
The Efik Language has undergone several linguistic classifications since the 19th century. The first attempt at classifying the Efik Language was by Dr. Baikie in 1854. Dr Baikie had stated, "All the coast dialects from One to Old Kalabar, are, either directly or indirectly, connected with Igbo, which later Dr. Latham informed that, it is certainly related to the Kafir class".
The Kafir Class was a derogatory term used to describe the Bantu languages. Thus, Dr Baikie attempts to classify the Efik Language as linked to the Bantu languages. The next attempt to classify the Efik language was by Rev. Hugh Goldie who classified the Efik Language as one of the Northern Languages which he states, "forms by far the greater part of its as the Semitic class does, from the root of the verb." Another attempt was made by Westermann who classified the Efik languages as belonging to the West Sudan group of the Sudanic languages. The present linguistic classification was made by Greenberg who groups Efik in the Benue-Congo sub-family of the Niger-Congo family. One of the criteria of the inclusion of the Efik language into the Niger-Congo family is its morphological feature. According to Greenberg, "the trait of the Niger-Congo morphology which provides the main material for comparison is the system of noun classification by pair of affixes.