GFCI (Ground Fault Circuit Interrupter) outlets are typically required in kitchens and bathrooms or other wet areas. They serve an important purpose, namely to protect you from electrocution. Plain vanilla GFCI outlets usually look something like this

Your typical GFCI outlet, available in 15 amp and 20 amp varieties

In kitchens and bathrooms, we sometimes recommend a slightly more advanced GFCI outlet that contains an LED night light. Energy efficient and better than most alternatives, this dual-function GFCI provides just enough illumination to make certain "landmarks" in a room visible while preserving your night vision. Below is one example from Pass & Seymour

That thin strip next to the "Test" and "Reset" buttons is an LED night light that will activate in low-light conditions and last for years. Also available in 15 and 20 amp versions.