World Wide Web vs. internet

World Wide Web

Usually the World Wide Web (except when used before a noun) a system of extensively interlinked hypertext documents: a branch of the internet. WWW

Usually the internet (except when used before a noun) a vast computer network linking smaller computer networks worldwide: includes commercial, educational, governmental, and other networks, all of which use the same set of communications protocols.
They advertised the sale in the local paper and on the internet.
My insurance company offers incentives to refill prescriptions over the internet.
Parents are advised to monitor their kids’ internet access and block websites with adult content.