Is it provide fully online classes or do I need to go the college in some days ?

In the online courses, the mode of education is online via the use of the Internet but some universities offer campus visits if individuals desire to visit the campus once.  In distance courses, individuals are required to take physical classes on the weekend as the whole mode of education is not entirely online. If the students opt for a technical course like B.Tech then they need to take classes physically with the advantages of flexible timing as those technical courses are not valid online or distance.  I hope this information helps you to resolve your query.

Hello Sibani, if you choose an online university, you do not have to visit college, you can attend online classes, and submit your assignments, and quizzes in an online web portal named LMS( Learning Management System) most online universities provide you with learning material through LMS that you can access anytime and from anywhere.  However, some universities also invite you to attend a few classes in a college to interact with you. In an interactive session like these, you can clear all your doubts, and it also helps you to know other students in your class.  

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Since your question is unclear, I assume you are asking about an online degree program, and in that case, you are not required to visit your college. Online degree programs are designed to allow you to study in your schedule from the comfort of your home. Thus, if you wish you can visit the college campus for your experience but the college would not force you to come even for exams in 100% online programs.