De-Ice an Anti-Ice
Hello Acars,
There are two types ice protection, de-ice, (similar to the stuff you would squirt onto your car windscreen) and anti ice, which comes in various "types" and with various percentages and even temperatures which all affect "hold-over time".
Basically anti-ice gives the aircraft protection whist taxying and getting airborne, and then after that the aircraft onboard heated leading edges will then protect the aerodynamic properties of the aerofoil.
Hope this helps!
A