The political tendency in America that describe themselves as "Libertarians" are extremely individualist, pro-capitalists who are absolutists about private property and essentially believe that instead of a government all social entities should be private corporations that contract with each other and individuals to form society. Ie instead of a city having a civic government there would be a corporation that privately owns all the property and leases it, a corporation that owns the streets, a corporation that provides police and military services, but only to people who contracts. Many of them don't go that far, but strongly believe that there should be little or no government regulation or interference in the economy.

It's a very unrealistic system and non-libertarians, ie almost all Leftists and almost all Democrats, along with a good proportion of Fascists (GOP and their allies) don't take Libertarians seriously.