Another simple way to understand:
Utilitarian Ethics: “The greatest good for the greatest number.” Here, the outcome matters. (Consequentialism) i.e. to design a mobile application (app) that fulfils the connectivity of the consumers into the world resources of knowledge and friendships.
Deontological Ethics: “Do to others what you would have them do to you.” (and similar rules). Here, the action matters. (Kant, Natural Law) Also known as the Duty Ethics - our duty ethically i.e. to care for the elders, our employees, to produce good quality products and services to our customers.
Virtue Ethics: “The virtuous person is the moral person.” Here, the person’s heart is what matters.