The digitization of the era turned on a mouse click or mobile phone touch as much as possible. As a result, methods have become easier and tasks have been calculated as simpler. From shopping to dating, business to research, holding business meetings to maintaining social contacts, all are at the same stage and the whole world is drowning in one period, ie online. To a large extent, learning is not limited to the classroom but also available on the digital platform known as e-learning or e-learning.

E-learning, the word defines the concept of learning through an electronic device such as desktop, laptop, CD-Rom, digital television or mobile. However, now learning through mobile phone is also referred to as learning m. Students have a different view of e-learning, some are very excited and enthusiastic, while others are hesitant about this innovative approach. Therefore, let us understand the term e-learning and its types and uncertainties by focusing on the following challenges and advantages.

Types of e-learning
In general, there are three types of e-learning - synchronized e-learning, asynchronous e-learning and mixed-mode.

In synchronized e-learning, the process is learned in real-time through a virtual classroom. The student and trainer must interact at the same time through the use of the Internet and communicate via messaging, chat, video conferencing or communication.

Asynchronous learning is learning through the recorded medium. Does not depend on the real-time learning process. Implemented through lectures, online courseware, embedded learning, courses or discussion groups.

Blending mode inculcates both synchronous and asynchronous learning features.

Advantages of e-learning
Flexibility: In the traditional classroom, students have to go to the college or institute regularly with the curriculum to be completed in a specific time period. While the e-learning method provides you with the flexibility to study at any time and anywhere with your own schedules.

Rapid learning: Students can quickly study their own interests. They do not need to try to reconcile with the speed and speed of the other student. They can conclude their course as quickly or as slowly as they want.

Access all the time: Curriculum and online materials are available that allow access anytime, anywhere, so students are not worried about when to sit, can do it anytime, anywhere.

Retention and high understanding: In online classes, learning is done through presentations, photos, and videos. It is a well-known fact that visual content is easily recorded in human memory from verbal and textual content. It helps to understand things better and increases the student's ability to understand.

Feedback and immediate results: In traditional education, it takes time to verify the copies and announce the results. During e-learning, tests are conducted through online tests. This has reduced the time required to achieve results and has also gained greater appeal among students because they do not have to confront the teacher at the time of the result.

A greener approach: The leaves are designed by logging. In e-learning, students save papers - save trees. Therefore, this is an environmentally friendly way to learn.

Cost-effective: Undoubtedly, using the Internet reduces the cost of paper, books, notebooks, files, pen and other fixed products. In addition, it also reduces the cost of travel to the college or learning center. Thus, e-learning is a cost-effective teaching tool.

Easy Update: It is very easy to update notes and other lectures in online mode by coaches, and it is really difficult to make changes in published books at short notice.

Technology and savvy in the Internet: Through regular access to the Internet, students become familiar with the devices. This brings efficiency in the use of the Internet and information technology.

However, e-learning has no great appeal and features. There are some challenges in this way of learning -

Self-Discipline: In a regular teaching methodology, teachers or teachers have greater control over students' attention and behavior. They stimulate students to learn through interactive teaching methods. However, in e-learning, the student must exercise restraint to study and learn.

Computer literacy: Students must have computer literacy skills and basic troubleshooting skills to continue studying without any breaks.

Availability of the system and the Internet: preferably a student system / laptop and high-speed Internet connection for e-learning.