Terminology

Unify the concepts of "Top-level Domain," "Second-level Domain," and "Subdomain" that appear in this document

Due to the inconsistent understanding of the concepts of Top-level Domain, Second-level Domain, and Subdomain among many people, this document will provide a unified explanation of these concepts:

• Top-level Domain (Top-level domain, TLD), for example: .com, .top, etc.
• Second-level Domain (Second-level domain, SLD), for example: example.com, example.top
• Subdomain, a subdomain of the Second-level Domain, for example: shop.example.com, shop.example.top

This explanation is only applicable to this document and the documents within the Blocklet platform.