The work function of a metal is

Metals:

• Metals are good conductors of heat and electricity.
• They can be drawn into sheets, and rolled to wire etc.
• They are malleable and ductile.
• They have high melting and boiling point.

Work function:

• The minimum amount of energy necessary to start the emission of electrons from a metal's surface is known as its work function.
• The work function is the minimum amount of energy required to remove an electron from a metal's surface to infinity.
• The threshold frequency of incident light is the lowest frequency at which electrons can be ejected without gaining extra energy.