The Experience API (xAPI, formerly known as Tin Can API) is a new eLearning specification considered as students’ learning experience and an API for sharing these data among systems for learning and for analysis. All kinds of formal and informal learning tools, inside or independently from an LMS, that are xAPI compatible can send information about the learning experience to a Learning Record Store (LRS) synchronously or later when an internet connection is available.
From this LRS, learning data can be shared with different LMS, servers, web applications or reporting tools for more flexible analysis and comparison.
Learning activities are recorded as activity statements composed by <actor> <verb> <object> (, with <result> in <context>), e. g. learner x completed interaction a (with result 80 %), learner y posted a comment on discussion forum b, (topic c).
Try this little exercise for some examples: