Sensible Heat: Ice being heated from -20°C to 0°C at constant rate. Temperature gradually rises This is sensible heat.
Latent Heat: When temp. reaches 0°C there is a lapse or period where further heating does not give a rise in temp. During this period the heat supplied causes a change of state and is known as Latent Heat. (Hidden Heat).
The change from liquid to vapour is called vapourisation: this may take place relatively slowly and from the surface of the liquid only, in which case it is called evaporation: or it may take place rapidly with bubbles of vapour forming within the bulk of the liquid itself and rising to the surface, in which case it is known as ebullition or boiling. The reverse process by which a vapour changes into a liquid is called condensation.