A block quote is a long quote formatted as a separate “block” of text. Instead of using quotation marks, you place the quote on a new line, and indent the entire quote to mark it apart from your own words.
The rules for when to apply block quote formatting depend on the citation style:
APA block quotes are 40 words or longer.
MLA block quotes are more than 4 lines of prose or 3 lines of poetry.
Chicago block quotes are longer than 100 words.