Who's Who
A Who's Who (or Who Is Who) is a reference work consisting of biographical entries of notable people in a particular field. The oldest and best-known is the annual publication Who's Who, a reference work on contemporary prominent people in Britain published annually since 1849.
In addition to legitimate reference works, some Who's Who lists involve the selling of "memberships" in directories that are created online or through instant publishing services, and have been described as scams.