What is copyright?
Copyright is the rights of the owner's property, and one must ask permission from that person to use any of their work. In shorter terms, if you use someone else's work that is stealing what they have created.
What is fair use?
This means that some things are allowed by owners for people to use for projects or presentations, BUT only a small portion of the owner's work can be used. An example of this would be someone quoting sentences from a research paper to better explain the topic they are talking about.