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This article gives a nice overview on this topic
Website portfolio is that where someone can put there work sample,resume,contact information if he/she desire also add a blog section in portfolio website.
Somewhere to display your work, whether it's web design based, web development based or anything else like illustrations, art, or graphic design projects. Of course, the list doesn't stop here.
Website portfolio is the showcase of your achievements and your work.
It could contain the projects you have done so far.
If portfolio could define your expertise, that is what can you do, then it has the content which it should have.