The two hard reflectors that redirected sun through the far window solved the problem of how to light the long corridor dramatically and quickly while maintaining the anonymity of resident juvenile prisoners. from Ross Lowells "Matters of Light & Depth"

The more mirror-like, or hard, the reflector; the more literally the light is reflected. For many purposes a less efficient and less obvious reflection is preferred. Depending on the way either are used, the difference can be subtle or more profound.

Soft lighting umbrellas, whether silver reflective, or white nylon, are also forms of reflectors. A common sheet of white paper, not to mention foamcore, mirrors, mylar, tinfoil, and even the broad sides of a white building or truck are examples that can be used as reflectors. So when looking for fill-light out in the real world, be inventive. A reflective answer may be staring you in the face.

Some reflectors are made of stretch fabric on easily collapsible hoop frames. While lightweight & convienent, they can billow in outdoor breezes and cause flickering in the reflected fill on your subject.

Other reflectors are rigid and made to be used on stands, usually with some built-in ability to be tilted & angled.