Circulation, in general, is the vital nerve of libraries and information services, and it is considered one of the most important public services provided by libraries and information centers and one of the important indicators of the effectiveness of the library and its relationship with the community of users. In the circulation department, library materials are borrowed or renewed or returned electronically. Also it is possible to apply there for reserving material, reporting its loss or inquiring about the amount of fine on material returned to the library after its due date.
Users could borrow books themselves through a special machine that works on the University ID card at the entrance of the university library. This card is also used for copying and printing, because the university wants to offer all these services by using one technologically sophisticated card automatically to facilitate and regulate usage.