Answer:
Only one seller.
Step-by-step explanation:
A monopoly is a market structure which is typically characterized by a single-seller (one seller) who sells a unique product in the market by dominance. This ultimately implies that, it is a market structure wherein the seller has no competitor because he is solely responsible for the sale of unique products without close substitutes.
Also, a monopolist refers to any individual that deals with the sales of unique products in a monopolistic market.
For example, a public power supply company is an example of a monopoly because it serve as the only source of power supply to the general public in a society.
A public power company refers to a company that provides power (electricity) utility to the general public of a society.
In conclusion, a monopoly is a market that has only one seller.