Philosophy:Means to an end
In philosophy, the term "means to an end" refers to any action (the means) carried out for the sole purpose of achieving something else (an end). It can be thought of as a metaphysical distinction as no empirical information differentiates actions that are means to ends from those that are not—that are "ends in themselves". It has been incurred that all actions are means to other ends—this is relevant when considering the meaning of life.
Immanuel Kant's theory of morality, the categorical imperative, states that it is immoral to use another person merely as a means to an end and that people must—under all circumstances—be treated as ends in themselves. This is in contrast to some interpretations of the utilitarian view, which allow for use of individuals as means to benefit the many.
In economics
Economics is ultimately a societal system which distinguishes means from ends. Modern economists, such as ecological economists, point out that our ultimate means are not labor or artifacts created through human production, but instead are ecological services provided by nature in the form of energy, low-entropy matter, chemical and biological composition as well as habitat stability[citation needed].
Further, ecological economists and many others discuss the notion of ultimate ends. For instance, does non-human life have intrinsic value? Most argue that the answer is yes, but processes for maximizing this value are perplexing[citation needed].
Idiom
A means to an end is also an idiom. It often refers to an activity (such as an undesirable job) that is not as important as the goal you hope to achieve (monetary gains for example). For example, Sam does not have any professional ambitions. For her, work is just a means to an end. One starts something and finishes it, without that something leading into something else, thus it is an end in itself.