A quote repeats words that someone else said or wrote. It is like reading one sentence aloud from a book while making clear that the words came from that book, not from you.
For example, an article might include a customer's exact comment inside a quote. The design often sets those words apart so a reader can tell they are being repeated.
Name or link to the person or source when that information matters. Keep the quoted words accurate, and do not use quotation marks to make your own words seem like someone else's statement.