it is a colloction of student's work ( evidence) to provide an authenatic representation of learning outcome. 

An ePortfolio may contain all or some of the following:

Files of various formats (text, pictures, video, etc.)
Evidence related to courses taken, programs of study, etc.
Writing samples 
Projects prepared for class or extracurricular activities
leadership
Evaluations, analysis and recommendations

Why would you want an ePortfolio?

Many jobs now require your eportfolio in their application, to see the knowledge and the skills that you have and might be helpful for the job.

It also can help you to archive your work and see your progress during the year and save your hardwork from lose

you can focus on your goals when you have an ePortfolio.

It will be available and easy to carry with you at anytime and anywhere.

There are many easy apps that can help you to start with and they are beautifully orgnaized so you can go step by step.