Generic Top Level Domain (GTLD) is a three character or more Top-Level Domain.
Extensions are .com,.net,.org etc….
In 2011,ICANN’s Board allowed the creation of new GTLDs.New GTLDs are nothing but Top-Level Domains.
Extensions are .link,.site,.web,.world etc…
Country Code Top-Level domains(CCTLD) is an internet Top-Level domain used and reserved for a company.We can identify CCTLDs as two letter Top-Level domains.
Extensions are .ac,.ad,.in etc…