By signing a "quit-claim" deed,
you are giving-up/transferring your-rights to a parcel of real-estate-property to someone else,
usually "in-exchange" for some-consideration
(and without offering any-warranty of your-entitlement to those-rights).
You might sign a quit-claim deed as part of the escrow-process when-selling a property,
when transferring your-rights to a relative/spouse/trust,
when "giving" your-property over to your mortgage-company in-exchange for forgiving/vacating your-mortgage...