A top-level domain (or Top-Level Domain, often referred to by the acronym TLD) represents the last segment of an Internet domain, i.e. the string of characters placed after the rightmost point of the URL. Because of its position, the TLD can also be called a domain extension.
In a domain name such as, for example, the TLD corresponds to “.com“. 

The main function of TLDs is to classify and categorise the domain, communicating the essential details of the website to the user. Thanks to TLDs, it is possible to obtain information on the owner, the geographical area or the primary purpose of the domain
TLDs also allow the Domain Name System (DNS), the system that translates IP addresses into names that can be easily understood and memorised by humans, to address and locate websites, allowing the browser to display the correct content.

Although in the early history of the Internet it was only possible to choose between 6 domain extensions, today users have a wide variety of top-level domains at their disposal. The spread of blockchain technologies has also led to the emergence of NFT domains, a suite of smart contracts that grant full control to the domain owner. 

The IANA (Internet Assigned Authority) in 2015 updated and distinguished the available TLD categories. 
Among the main types of domain extensions, we can identify: 

  • Generic Top-Level Domain (gTLD): they describe the main activities associated with an Internet domain. Within this classification, it is possible to identify some of the most widely used TLDs such as “.com“, referring to commercial activities, “.org” for organisations or associations or even “.net“, initially used by Internet providers. 
  • Country-Code Top-Level Domain (ccTLD): category specifying the geographical origin of an Internet domain. The “.it” TLD, for example, is used to represent dependence on Italy, while “.fr” refers to France.
    Country-code Top-Level Domains are also exploited by Google to geolocalise the website if the latter has different versions based on the language and nationality for which it is intended. 
  • Sponsored Top-Level Domain (sTLD): top-level domains sponsored by a community or private organisation. These include “.edu“, mainly exploited by universities or academic bodies, or even “.xxx“, used by sites specialising in pornographic content. 

The complete and up-to-date list of all TLDs can be consulted on the IANA website.

Correlated words


'Hard' monetary policies aimed at raising interest rates to combat inflation.


Monetary policy characterised by low interest rates and higher levels of employment aimed at fostering economic growth.


Organisations that manage all information relating to top-level domains.


Stringa di caratteri associata in String of characters uniquely associated with a resource on the World Wide Web. univoca ad una risorsa sul World Wide Web.

IP address

Numeric strings that uniquely identify every resource to the network

Web 3.0

A term often associated with the idea of the 'Semantic Web' and data interoperability, it represents the next phase of the Internet.


Organisation that manages domain names on the Internet and assigns IP addresses.


Organisation that deals with the sale and registration of domain names.


Hierarchical server system that, on the Internet, associates each domain name with an IP address.

Financial Market

The financial market is a regulated space where financial securities can be bought and sold.


Cashback involves a partial reimbursement of funds spent in a transaction.


Third historical phase of the web, during which the economic and technological system of the internet changes thanks to the tools offered by blockchain.


The longest-lived cryptocurrency on the market and the first application of blockchain.

Wallet address

The string of characters that identifies a cryptocurrency wallet.


Cryptocurrencies pegged to the price of a stable asset such as a fiat currency or precious metal.


Managing one's wallet by knowing its private key

White Paper

Technical and informative document used by cryptocurrency projects to present their technological proposal.


Software that allows you to send, receive and store your cryptocurrencies.

Virtual Currency

Term used in legislation to define cryptocurrencies.

Fiat Currency

Legal tender, i.e. the official currency adopted by a government.


Digital unit of value based on a third-party protocol.

Satoshi Nakamoto

The pseudonym of the creator or group of Bitcoin developers. Their true identity is unknown and they no longer have an online presence.


Open-source software is public and available for anyone to reuse.


Identity verification procedure required by European regulations for exchanges.

Hard Fork

A division of the blockchain due to the incompatibility of the new version of the protocol with the previous one.

Hot Wallet

A cryptocurrency wallet connected to the internet.


The halving of the reward given to miners for producing Bitcoin blockchain blocks.


A sector that combines finance and technology, where companies develop technologically innovative financial services.


The branch of computer science that studies secure communication methods.


Virtual currency based on cryptography and blockchain.


A cryptocurrency that is natively based on its blockchain

Public Key

Cryptographic code that identifies a wallet on the blockchain.

Private Key

Cryptographic code that gives access to a wallet.


Tools that simplify the development of apps and web services.


Cryptocurrencies that followed Bitcoin as alternative solutions.


Anti-money laundering regulations prevent illegal activities on centralised exchanges.


The procedure applied to solve a problem.


Services facilitating the purchase and sale of digital assets based on daily market prices.

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