A domain name can serve a variety of purposes, including:
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The highest level of domains is called the top-level domains (TLDs), and they are classified by the extension of their domain name, like .com, .net, .org, .gov, and .edu, among others.
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The top-level domains (ccTLDs) belong to countries and are country-specific. For example, .uk is the domain extension for United Kingdom, .ca is the domain extension for Canada, and .au is the domain extension for Australia.
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There are a number of generic top-level domains (gTLDs), such as .com, .info, and .name, that are not restricted to a particular country or purpose.
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The second-level domain (SLD) is the first part of the domain name directly below the top-level domain (TLD), such as example.com.
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Creating subdomains under a primary domain has the advantage of providing unique names for each of the domains, for example blog.example.com.
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Registered domains with no active websites and used to redirect traffic to the primary websites are referred to as parked domains.
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Due to their value as a memorable and easily recognizable domain name, premium domain names are typically sold at a premium price.
It depends on the nature of your website and your goals for your online presence to determine which type of domain would be most appropriate for your needs.