A portfolio is a structural collection of a person's progress, achievements, contributions and efforts that demonstrates accomplishments over time.
Portfolios vary by career field, experience, personal taste and scope.
Your portfolio can be a simple companion page for your resume, a notebook or folder full of original materials illustrating your abilities, or anything in between. Traditionally portfolios have been used in fields like art, education and writing. Portfolios are now a growing trend in many other career fields as well. There are no strict rules about what to include or how to structure your portfolio. The purpose and content of your portfolio will be determined by your career goal.