Producer surplus is the difference between what producers are willing to accept for a good or service and the actual price they receive in the market. This concept highlights the benefit that producers gain when they can sell their products at a higher price than their minimum acceptable price, often represented visually as the area above the supply curve and below the market price on a graph. It connects to market equilibrium as it reflects how efficiently resources are allocated, and changes in equilibrium can lead to shifts in producer surplus based on supply and demand dynamics.