Aya, Nesrine, BOUALI TRIKI2022-05-152022-05-152020جامعة العربي التبسي تبسةhttp//localhost:8080/jspui/handle/123456789/3887Code-switching is used by bilinguals and multilinguals. It's a phenomenon which attracts great attention in the field of sociolinguistics. This research aims first to find out if the phenomenon of code-switching exists between students, second to discover the reasons for code switching in a conversation, he also highlighted the phenomenon in the Algerian context. For this goal, a questionnaire was used as a research tool and addressed to thirty-three third-year English students at the University of Tebessa. Analysis and interpretation of the data showed that students in third graders change the codes during their conversations either inside or outside the classroom. They also change between languages ​​for multiple reasons, one of them being the lack of vocabulary in the language as well as to understand others and to be understood. Finally they frequently change between languages ​​in all situations and settings.enthird-year students, code-switching, bilingual, multilingual, sociolinguisticsThesis