It’s conventional wisdom that you should have a portfolio to show off at interviews. Portfolios give visual credence to what you say you can do and make you memorable among the jumble of candidates.
Here's the right way to answer when asked how to describe yourself in a job interview.
Q: I have an interview and I was wondering how to present my work samples to the interviewer? I have a bulky, fake leather, large portfolio that looks great and presents my work in its original form, ...