Abstract This paper introduces the sociological concept of focused encounters (FEs) as a tool for researching interaction in second language acquisition and teaching. FEs are face-to-face interactions affording joint attention, intersubjectivity, interaffectivity, and interactional alignment, considered key contributors to learning in some SLA/T approaches. First, we introduce the FE concept. Second, we situate FEs within a sociocognitive approach to SLA/T. Third, we apply the FE concept in investigating interaction in an Australian English as a second language classroom. Fourth and finally, we discuss our analysis’s wider implications for learning and teaching: Studying interaction in FEs from a sociocognitive perspective enables investigation not just of language learning opportunities but of moment-by-moment learning processes.