This is a business structure which prevents members of a company being personally responsible for the liabilities of the company. This legal protection frees people up so they can attempt to create things without risking losing their house and the literal shirt off their back.
Most countries have a similar structure available (though they are all different). In Australia: "Pty. Ltd.", in Britain "Ltd.", Germany "GmbH", United States "LLC", France "s.a.r.l", Italian "s.r.l" and so forth.
My book "Choose Your First Product" is available now.
It gives you 4 easy steps to find and validate a humble product idea.