Immanuel Kant: morals are categorical imperatives -- morality is an absolute objective truth which exists independent of human thought and opinion.
John Stuart Mill: ethics are constructed by humans on the basis of utilitarian and practical considerations. Consequences matter in the context of ethics. Whatever brings happiness to the greatest number of people is a true measure of morality.
John Stuart Mill: ethics are constructed by humans on the basis of utilitarian and practical considerations. Consequences matter in the context of ethics. Whatever brings happiness to the greatest number of people is a true measure of morality.
According to Kant there are absolute truths of morality. One can arrive at these truths through rational thought. Kant gives us various formulations of his rule of the categorical imperative which is, Kant believes, wholly derived from rational thought.
In contrast to Kantian ethics, the nature of morality in Mill's formulation of utilitarianism does not require an appeal to absolute ethical truths separate from situational applications. For Mill, morality is established through consideration of the utility to humankind of any given action.
https://www.csueastbay.edu/philosophy/reflections/2008/contents/tyrus-fish.html