Also quotations don't always have to be for searchterms that consist of several words, it can also be used when youtube/google decides that it doesn't know your searchterm and assumes you made a typo, then autocorrects you without asking.
Like searching for csrs, it would probably be changed to cars or something, if you'd type "csrs" however it should indicate you don't want it to be changed, also works well on google search in conjunction with verbatim mode, for which there is also an extension to force that by default