Every different citation format / system calls that list of ALL the sources you got information from that's at the end of your paper, slide deck, etc. something different. This page is general information, not specific to any one citation format, so for all the details, go see our General Citation Guide.

A bibliography is a list of sources, formatted according to one of the available citation styles. Its function is to give you all the information you need to go and get the information sources that were cited in the paper (or other format). Every citation in the text must have a matching full citation in that bibliography at the end (but only one citation entry if the same source is cited multiple times)

Since scholars learn from those who came before them, this is the custom of higher education., an ethical necessity, and also required to correctly acknowledge / attribute the authors whose intellectual property you benefited from (in a Fair Use manner).

That's a large part of why citing correctly becomes such a Big Deal at university.