This thesis aims to explain virtualization and its use for the implementation of virtual classrooms. Reader is gradually introduce, what is virtualization, how virtualization works, what has parts, what are the technologies used and how many is this virtualization. Reader is gradually acquaint with the concept of virtual classroom, how virtual classroom works and what are the solutions of virtual classrooms. Individual solutions of virtual classroom are explained and compared. At the end of this work is the selection of solutions virtual classrooms, and example of actual implementation of virtual classrooms, including the price of solution. The work has to show possible and effective solution of the virtual classrooms.