gTLD is one of the categories for Top-Level Domain Names. It stands for “generic” top-level domain, such as .org, .com, and .net. Other popular categories are ccTLD (country codes), which are managed or controlled by the particular country, and IDNs (Internationalized Domain Names). Domain names are either “open” or “closed”: anyone can register for an open domain name, while closed domain names require an application process.