I=Interest
D=Desire
A=Action
AIDA is an acronym used in marketing that describes a common list of events that are very often undergone when a person is selling a product or service:
Nowadays some have added another letter to form AIDA(S):
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The AIDA Model
AIDA model is initiatory and simplest.
AIDA model was presented by Elmo Lewis to explain how personal selling works. It shows a set of stair-step stages which describe the process leading a potential customer to purchase.