What is a Registry and what are its functions?

A Registry is the body that is responsible for assigning domain names and for managing domains and the relative technical infrastructure needed, under a particular extensions (.it, .eu, .com, etc.). The rules of the network are fixed by an international organization, Icann (Internet Corporation for Assigned Names and Numbers), which is also responsible for appointing certain bodies to carry out the functions of a Registry (technically, a Registry is 'delegated' by ICANN) for managing various extensions (.it, .fr, .com, etc).  In 1987, ICANN appointed the Italian National Research Council (CNR) to manage .it domains. This is how the it. Registry was founded, which has its offices at the Institute of Informatics and Telematics of the CNR in Pisa.