Polaroids:-

A set of Polaroids are quick & easy to take by anyone in the office - but don't discount them. Whatever their ultimate purpose be sure your as far as practical at your best.

The term really applies to any quickly taken without fuss images for record and ofcourse can be digital, or shot in a pro studio.

But these so often are the way models get selected & actors get the final audition - so they are very important.