A schoolyard or school campus is the region within the boundaries of a school used for teaching, extracurricular activities and other aspects of daily life at school. Schoolyards often have an entrance guarded by a security guard.
However, some schools do not use a wall to indicate the range of the schoolyard, in these cases the general activities of teaching and after-school activities can also be called campus life and "schoolyard" or "campus" often is used as a synonym for school life.
The term also may refer to only the outdoor portion of a campus, distinguished from classroom space. In this context, the schoolyard may be used as a teaching space to instruct students about ecological systems.
References
Schoolyard Wikipedia(Text) CC BY-SA