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The fair use is one of very critical part of Copyright act that defines certain limitations on ownership.
If you want to reuse, reproduce or re-distribute contents that are originally created by others then it is always recommended to take explicit consent from the content owner. But it may not be always possible to take the formal approval from the content owner or sometimes you may want to use the information for educating/sharing with others just as facts, without any implicit interest and without intentions to cause any direct/indirect damage to content owner.
Please note that Copyright protects the particular way authors/owners have expressed themselves. It does not extend to any ideas, systems, or factual information conveyed in a work that’s where fair use doctrine comes into picture.