TLD stands for "Top Level Domain" Some examples of TLDs are domain extensions you are likely familiar with, such as com, net, and org. In other words, the part of the domain name to the right of the dot (.).
Some TLDs signify the type of web site. For example a .gov domain is a US government web site. The TLD .edu signifies a web site run by a education institution such as a grade school or university. The TLDs .com, .net and .org started out with specific associations, but have since become universal TLDs.
SLD stands for "Second Level Domain". A second level domain is the part of the domain to the left of the dot (.). Typically the part of the domain you make-up.
For example, the name of this web site is "AwardDomains.com". The SLD is "AwardDomains". The TLD is "com".
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