e-learning is one part of a larger group of distance learning. This state of learning generally refers to learning where the teacher is separated from the students, time and place. For a long time, such an exchange of letters continued learning studies. There are two kinds of online learning, which is the usual practice, the network today. They are asynchronous and synchronous forms of instruction (Kevin, 2009). Synchronous means literally, at the same time. In this type of training, student interaction with teachers via the Internet in real time. In asynchronous education gives students the supervisor to perform the proper time for convenience (Fisk et al, 2009).

synchronous training is currently not very common, because the technicality involved in its implementation. This course requires students who are geographically dispersed access to the same place at the same time director. In this training, the instructor will send audio material to students via a web-based audio or telephone conference, call us (Kevin, 2009). Instructor to use a slide show that accompanied the students to see the conference website. Students have the opportunity to interact with the teacher via the chat window, or contact by telephone vote. This type of training is best suited for academic programs, distance learning modules, such as college or postgraduate degree. Asynchronous learning is more common because it offers an on-demand, just-in-time learning experience for students (Fisk et al, 2009). In this case, students do not need to schedule their time according to the director. This training should be more flexible and easier titled, self-paced asynchronous training. In asynchronous facilitate training, the instructor interact with students at different times (Fisk et al, 2009). Instructor posts assignments of such materials on a Web page, including all the necessary references for students. Students can then discuss and communicate with threaded discussions, and subsequently joined by e-mail to the competent authorities. Students with this type of training to enjoy plenty of interaction with other colleagues in a web-based discussion topics (Fisk et al, 2009). The restriction of this type of lack of education is non-verbal communication, which means that difficult to learn the concept is not well explained to students. It is also a challenge to set schedules between the students who are geographically separated from the trainers. Self-paced instruction is more prevalent in enterprises, as opposed to universities. This manual, stand-alone products is available on the Web instructors, where they will be opened, and the Internet. Materials such teaching can be assessed exercises, simulations, discovery learning and guided tutorials.

the development and expansion of information technology has gone hand in hand with the online revolution in education. The workforce today, the requirement for professional development through training is essential for one to compete effectively. Of working adults, acquiring such development requires the necessary commitment of time limited in the light of their family and social responsibilities. E-learning tools developed as a tool of some of the problems experienced by individuals are limited in time and space limit. E-learning is able to meet the challenges of physical barriers and time constraints to overcome. More and more universities have developed online training programs, which is recognized as the authority for rapid growth from the previous year. A revolution in online learning institutions, the need for increased education and training needs and activities of non-traditional students who are temporary, because the use of full-time obligations. The invention of evening and weekend classes do not fully meet the needs of adult education during the weekend to find himself tied up with family obligations. Thus, online education has become a definitive response to these student groups (Askov & Simpson, 2001). Online training to be successful, it requires that students have a good computer knowledge. This is reinforced by the steep exposure of the population of familiarity and widespread use of computers in the last two decades. Internet users in North America greatly swelled estimate of 251.735 million, total growth was 73.9% in North America alone, compared with 2000, when Internet users were estimated at 108 096 800 (Mini-Watts, 2009). This is an indication that more and more people are now using the Internet. The statistics are indicative of the number of people are doing online colleges can use very little use. As a result of the new millennium have seen a number of institutions actively involved in developing online programs aimed at international standards, and students learn.

Many universities have adopted a hybrid learning. Hybrid learning is often used interchangeably to refer to blended learning. This learning, which is now a general web-based instruction, traditional face-to-face teaching integrated with well-organized web-based modules. The learning process, a significant proportion of the traditional face-to replace the web-based training (Koohang & Durante, 2003). Hybrid learning is used a lot of practical courses in which students will be experimental tasks of physical disability, the certificate contains. Radiology, this type of learning is more suitable, because it would give students the opportunity to interact with the physical interaction of biomedical devices and meetings with teachers. Face to face experience also gives students the opportunity to ask questions and explain that they are difficult to understand and written material via the Internet to clarify. Benefits of such learning, as found in the literature, flexibility, interaction, reducing the time to seat, comfort, lower costs and more likely to learn. Challenges related to hybrid instruction identified by the complexity of developing software that would be useful to teachers and students. This is a fact that online programs offer students from distant countries and regions (Koohang & Durante, 2003). It is also a challenge for the distribution of the time required to re-design and adaptation of courses for students to learn the hybrid systems.

modern information technology has been used over time to create and support institutions. changes in technology over the centuries of research, is changing constantly forced to comply with the latest and most reliable technology. During the Middle Ages through the student exchange oral tradition, and students were forced to rely on memory and word of mouth. The invention of paper and the printing press revolutionized the learning, which is now done using the books (Sumrall, 2002). Changing books faced challenges, such as cataloging books, and he asked to develop systems that can easily support the teaching of using the books. The need to integrate technology education is a constant demand for new technology is needed to continue to happen. In 21 century, the challenge of education is necessary to include the Internet and related tools for e-learning update (Sumrall, 2002).

are external programs (via correspondence) for a long time. Distance learning occurs in the first list of the University of Wisconsin in 1892 (University of Wisconsin, 2005). Australia, which is considered a model for correspondence online learning programs since 1890 was mainly due to low population density and irregular settlement patterns. United States, correspondence learning, online learning model, joined in 1920. Columbia University, for example, correspondence programs offered in 1920. Rise in the exclusive online training centers, however, is more efficient to include the revolution of computers. Pioneers of e-learning in the United States was the Regents College Regents external courses. The setting is now an accredited school. California, the California Western University was one of the pioneers and is now approved by the State Department. Online programs are labeled for a long time, some see them as inferior programs.