It can be useful in adding your own emphasis within a quoted passage (in which case note «[emphasis added]» at end of quote) and to highlight terms in, for example, a glossary or a lis (ethicsandclimate.org)
For the rest of the day, try ending all of your quotes to the press with «world.» (slashfilm.com)
, There were no unusual things that occurred during the surgery that required additional procedures to my knowledge, so the additional $ 633 over the top end of the quote was quite a surprise. (local.demandforce.com)