What is the difference between act and rule utilitarianism and how do they each approach ethical decision-making?

Act utilitarianism focuses on the consequences of individual actions to determine what is morally right, while rule utilitarianism considers the consequences of following certain rules or principles to guide ethical decision-making. Act utilitarianism looks at each situation separately to maximize overall happiness, while rule utilitarianism emphasizes following rules that promote the greatest good for society as a whole.