The supply relationship is the relationship between Price ($) and the Quantity Supplied (how much or how many are available or produced). If consumers are willing and able to pay a higher price for an item, producers will supply more of the item. 

When producers supply more for sale at a higher price, they increase their revenue (profit).

Example: It costs a supplier $10 to produce a Doodad of any colour. Consumers are willing and able to pay $15 for a Doodad of any colour.

However, after a famous personality buys a pink Doodad, some consumers are willing and able to pay $25 for a pink Doodad.

The supplier will increase the supply of pink Doodads to increase profit.