1. Derek Stockley (2003) The delivery of a learning, training or education program by electronic means. E-learning involves the use of a computer or electronic device (e.g. a mobile phone) in some way to provide training, educational or learning material. 

2. Marc Rosenberg (2001) confines e-learning to the internet as: the use of internet technologies to deliver a broad array of solutions that enhance knowledge and performance. It is based upon three fundamental criteria:

• networked
• delivered to the end-user via a computer using standard internet technology
• focuses on the broadest view of learning

3. Department of Computer, University of Liverpool (2007)defines E-learning is learning which is enhanced, supported or assessed by the use of electronic media. E-learning may involve the use of new or established technology and/or the creation of new learning material; it may be deployed both locally and at a distance.

4. Antaseeda and Chaisong (2012) defines e-learning is the use of new technologies and social network as tools or instruments to support teaching and learning.