Students studying together inside their classrooms is widely advocated in the literature on teaching methodology. This paper provides a brief overview on the idea of students also studying together outside of class, either face-to-face or electronically. Such out of class student-student interaction offers many of the same benefits of in class collaboration. Teachers and students have for many years been organizing this student-student interaction, whether it is: organized by the educational institution, such as peer mentoring programs or special facilities; organized by teachers and instructors, such as in the case of group projects on which students are assigned to collaborate; or organized by the students themselves, for instance, two or more students who decide on their own to come together to study for an exam or to offer each other online feedback on their essay assignments. The paper's structure is based on answering the 5W and 1H questions about Out-of-Class Academic Collaboration, i.e., who, what, when, where, why, and how. Nineteen references are provided from practical, research, and theoretical works.