Key Light: the main source of light in a photograph or film.

Fill light: added light used that does not change the character of the key light but is used to lighten (add light into) shadows.

Background light: additional lighting that does not change the look/ mood or effect of the key light, but lightens the background.

Reflector: reflective object used to bounce light back into shadow areas. This can be adjusted by placement, angles, and color of the reflector (gold is warm light, silver is cool light, white)

Hot light: powerful light often used in film, tv, and photo that provides a constant light source. The source is often incandescent (warm 2500K-3000K). 

Strobe: is a light used to produce higher amounts of light in flashes. Often, strobes produce 300-800watts of light- most regular light bulbs produce between 23-100 w of light. 

Pocket Wizard: Transmitter and tranceiver radios that "speak" to each other in the studio. The transmitter attaches to the hot shoe on your camera, the tranceiver attaches to the strobe. Channels and modes must be the same in order to 'communicate' to each other. You must shoot slower than 1/200 of a second. You must use the manual mode, and shoot through the viewfinder, not the display screen.