How does a firm's demand curve shows the relationship between price and firm's sale? How can quantity demanded of the firm's output be equal to the sales of that firm?

Shri Lakshmi,

Sales for a firm is defined as how much quantity of the commodity is demanded by consumer. So, quantity demanded of firm's output by the customers is equal to the sales of that firm. So, in this way the demand curve shows the relationship between price and quantity of the firm's output demanded by buyers(sales).