Code switching is a widely observed phenomenon especially seen in multilingual and multicultural communities. In ELT classrooms, code switching comes into use either in the teachers' or the students' discourse. Although it is not favoured by many educators, one should have at least an understanding of the functions of switching between the native language and the foreign language and its underlying reasons. This understanding will provide language teachers with a heightened awareness of its use in classroom discourse and will obviously lead to betterment of instruction by either eliminating it or dominating its use during the foreign language instruction.