e-Learning is the one of efficient learning system and recently generalized. e-Learning is widely utilized thanks to its accessibility for information and knowledge. It is the learning system which uses network environment like internet as the base to support instructional activities.
It is the concept which combine Information Communication Technology(ICT) and learning system.
Specifically, e-learning is composition of network environment, ICT and learning system which performs instructional-learning activities.

ince e-Learning uses internet which is the most widely-used network as the basic learning environment, users can study everywhere internet access is available. The internet network has two different type; Cable and Wireless. In late 90s and mid 2000s, cable is more widely used internet access. But recently wireless internet such as WiFi, Wibro has became more popular.
e-Learning utilizes various technologies such as HTML, Hyperlink, AJAX(Asynchronous JavaScript and XML), RIAs(Rich Internet Applications), RSS(Really Simple Syndication or Rich Site Summery), Folksonomies, Podcast, Wiki, Weblog, Blog, Social Bookmarking. Advanced technologies mentioned above is the efficient tool which helps learners not only to search learning contents (mainly reading contents and hearing lecture) but also to participate learning activities by posting their own opinion and discussing issues.
These days, learners can actively participate learning activities according to personal interest and re-constuct knowledge by interaction among co-leaners. This trend is completely more than previous learning style learners only focus on understanding and acquisition on contents.