What is a second level domain

In the Domain Name System (DNS), a second-level domain (SLD) is the part of a domain name that comes after the top-level domain (TLD). For example, in the domain name "example.com", "example" is the second-level domain and ".com" is the top-level domain.

A second-level domain is a subdomain of a top-level domain and is typically used to identify a specific organization, entity, or brand. SLDs are often used to create a hierarchical structure for domain names, making it easier to organize and categorize domain names.

Here's an example of a domain name with multiple levels:

In this example, "example.com" is the top-level domain, "example" is the second-level domain, and "sub" is a sub-second-level domain (also known as a subdomain).

Second-level domains are often used to create a namespace for a specific organization or brand, and can be used to create a hierarchy of subdomains. For example, a company might use a second-level domain like "corp.example.com" for its corporate website, and then create subdomains like "hr.corp.example.com" for its human resources department.

Some common types of second-level domains include:

Overall, second-level domains play an important role in the structure of the internet and help to organize and categorize domain names in a meaningful way.