Final answer:
The invisible hand refers to the unseen forces that regulate the market and economy, and it suggests that individual self-interest can benefit society as a whole.
Step-by-step explanation:
The invisible hand refers to the unseen forces that regulate the market and economy. According to Adam Smith's principle, individual self-interest, or selfish actions, can unintentionally lead to benefits for society as a whole. Smith argued that when individuals make rational choices to maximize their own profit, they inadvertently contribute to producing goods and services that are most needed by society.