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Progress in technology has changed the whole aspects of human lives. The effect of this change is more apparent every day. Education is one of the areas that had significant impact on information technology, such that without information technology is not possible education and learning. Virtual classroom is one of the products of ICT in education. Virtual courses do not require a physical presence in the classroom and Students can take classes in terms of geographical distribution and can exchange the information. Many of the activities that take place in virtual classrooms, It is similar to traditional classroom programs but nature and spatial that is performed these activities, are different. In virtual courses, Students can have access to the content of the education courses at any time day in different formats (text, video, audio).In this paper, we will describe characteristics of a virtual classroom environment and will examined learning methods in the virtual classroom and security and existing challenges.