Differences between top-level, second level and third level domains Differences between top-level, second level and third level domains

A top-level domain (aka extension or TLD) is a domain that can be used to identify a specific territory or a generic kind of activity. In the first case, we will talk about ccTLD (country code top-level domainsuch as .IT, or .FR or .ES identifying specific geographic areas such as Italy, France and Spain. In the second case, we will talk about gTLD (generic top-level domain), usually used by organizations to identify their activities (for example, .com extensions are often used by sales organizations). Otherwise other top-level domains such as .GOV, .MIL and .EDU are reserved to the government, army and educational authorities of USA. 

The most popular top- level domains are: 
  • .COM
  • .NET
  • .ORG
  • .INFO
A second level domain identifies the subject, product, brand, company or service promoted with the domain. For example, in www.keliweb.com "keliweb" can be identified as a second level domain, representing the company that promotes its products with a domain. The second level domain identifies essentially "what the domain is about".

The third level domain (aka subdomain) identifies a specific part or section of the domain itself. For example in blog.keliweb.com  or faq.keliweb.com "blog" and "faq" represent a part of the whole domain.

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