In the past, I have worked for a small company where I knew the owners. Although I worked for free and was never registered as an "employee," I only did it for the experience. On my resume, I initially wrote the work as "volunteer." But, then, I was advised by a career counselor that I should instead say that I was an "intern."
My question is: Would this be appropriate? When I go in for an interview, I plan on disclosing this information to the hiring manager.