There Are two types of portfolio. The first is Showcase portfolios and second, Collection portfolios. Showcase portfolios is used to display student's best work to parents of school administrators. and Collection portfolios contains all of a student's work that shows how a student deals with daily class assignments. (source: O'Malley, J. Michael and Pierce, Lorraine Valdez. 1995. Authentic Assessment for English Language Learners: Practical Approaches for Teachers. Longman).
here is the example cover of student's portfolios:
