What is plumbers putty and how is it used in plumbing projects?

Plumber's putty is a soft, pliable substance used to create watertight seals around Plumbing fixtures like sinks and drains. It is applied by rolling it into a rope-like shape and then pressing it into place between the fixture and the surface it is being installed on. The putty helps prevent leaks by filling in gaps and creating a tight seal.