According to Clemson University:

“An ePortfolio is a collection of work (evidence) in an electronic format that showcases learning over time. When you think about your ePortfolio and the types of evidence that it contains, it is important to think carefully about its purpose and intended audience.”

In addition to that, I personally think that the best e-Portfolio is the one e-Portfolio is created by someone else like if a Panda says himself is cute is not that powerful than a Polar Bear says he is cute 🙂 due to the benefits of ePortfolio is writer friendly, user friendly and usually reachable by the searching engines such as an ePortfolio done by WorldPress.

Reference:

https://www.clemson.edu/academics/programs/eportfolio/information.html#:~:text=An%20ePortfolio%20is%20a%20collection%20of%20work%20%28evidence%29,may%20contain%20all%20or%20some%20of%20the%20following%3A