This research is undertaken at the Secondary Level of Bangladesh Open University (BOU). It attempts to present the frequency of Code-switching and students‟ perception towards it and their functions in facilitating EFL learning. Using questionnaires as a method of data collection, the findings reveal that instructors frequently code-switched between Bangla and English. This phenomena was related to both teachers‟ and students‟ language competence. Students exhibit positive perceptions towards it as a learning tool. Analyses of data reveal that Code-switching helps students to learn their lessons. Moreover, the students are welcoming codeswitching very much.