Basically, it is a quick summary of your product or the business idea you are trying to promote. It should consist of two major parts:
Pain statement: The problem you are trying to solve.
Value of Proposition: A promise of value to be delivered.
And most importantly, try to keep everything within the time-frame of 30 seconds to 2 minutes.
Keep in mind, you have to work on your elevator pitch in order to be ready because your next prospect might just be around the corner. This business tool is universally applicable, make sure always walk around with your elevator pitches