Answer
Signaling is an action taken by an informed party to reveal or inform the private information to an uninformed party.
For Example
Various Firms spending money on advertising of their goods and services to customers is a kind of signaling.
Screening is an action taken by an uninformed party to induce an informed party to reveal information.
For example :
A person asking for the used bike to be checked by an autos mechanic before it is sold to him.
