TLD

A TLD (Top-Level Domain) is the highest, final segment of a domain name — the part that appears after the last dot in an address. In the domain nodea.pl the TLD is .pl; in example.com it is .com. A TLD marks a branch in the hierarchical structure of the Domain Name System and determines which set of name servers is responsible for a given ending.

How a TLD works

The domain name system has a tree structure. At its top sits an invisible root dot, below it the top-level domains, then second-level domains (such as nodea in nodea.pl), and lower still the subdomains. Each TLD is governed by a dedicated registry — for example, the .pl domain is managed by NASK. When a browser resolves an address, the query travels from the root servers, through the servers responsible for that TLD, down to the domain's own NS records. The main TLD types are: gTLD — generic domains (.com, .org, .net); ccTLD — two-letter country codes (.pl, .de, .fr); new gTLDs — thematic endings introduced since 2013 (.shop, .app, .blog); and sTLD — sponsored, restricted-access domains (.gov, .edu).

Practical application

Choosing a TLD is one of the first decisions when setting up a site. A country ending like .pl builds trust among a local audience and supports local SEO, while .com suits projects with a global reach. New thematic TLDs let you build a shorter, more descriptive address when your preferred name is already taken under the popular endings. You can look up a domain's owner and registry in the WHOIS database. After registration and delegation setup, you still have to wait for DNS propagation before the address works across the whole internet.