Second-Level Domain
A second-level domain is located directly “below” a top-level domain. For example, many British web addresses end in .co.uk rather than in just .uk.
Second-level Domain
What is a Second-level domain?
A second-level domain is located directly “below” a top-level domain. For example, many British web addresses end in .co.uk rather than in just .uk. Similarly to a second-level domain, a third-level domain adds another “layer” to the mix.
Example:Besides .co.uk, some more well-used examples of second-level domains include .com.mx, .co.in, and .co.za.