What is a second-level domain name? What are the advantages of a second-level domain name for a website?
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The subdomain is the part of the domain name relative to the primary domain name (main domain name), which is located before the primary domain name and after the primary domain name.
1. What is a subdomain?
The subdomain is a branch of the root domain, in the format of xxx.example.com. For example:
blog.example.com (the subdomain of the main domain example.com)
shop.example.com (an independent e-commerce subsite)
Unlike subdirectories (such as example.com/blog/), subdomains have independent servers, content, and SEO weight, but can pass on some trust through the main domain name.
2. The four core advantages of building a website with a second-level domain
1. Improve inclusion and traffic
Search engines (such as Google and Baidu) regard subdomains as independent sites, and inclusion is faster when the content is high-quality.
Case: A company's main site includes 500 pages. After adding news.example.com, the total inclusion increased to 1200+ pages.
2. Strengthen the weight of the main site
When the content of the second-level domain name is related to the main site, the weight can be transferred through internal links (pay attention to the consistency of the theme).
Counterexample: If the content of blog.example.com is not related to the main site, it may lead to dispersed weight.
3. Independent operation flexibility
Support independent servers, programming languages (such as PHP for the main site and Python for the subsite) and brand image design.
Fault tolerance: When the main site is down, help.example.com can still be accessed normally.
4. Multi-dimensional brand exposure
User perception: app.example.com is more professional than example.com/app/.
Applicable to multiple business lines (such as e-commerce, forums, API documents, separate operations).
3. Suggestions for the application scenarios of second-level domain names:
Choose a second-level domain name: large business differences (such as multinational sub-sites), independent brands are required, and the content volume is high.
Choose a sub-directory: the content is closely related, resources are limited, and the weight concentration is pursued.
4. Operation suggestions
1. Content strategy: The content of the second-level domain name needs to be verticalized (such as zh.example.com focuses on Chinese users).
2. Technical configuration:
Ensure that there are reasonable internal links between the main site and the second-level domain name (such as navigation bar links).
Submit an independent XML site map to the search engine.
3. Risk avoidance: Avoid excessive splitting (such as splitting the same theme into 10 second-level domain names), which will lead to weight dilution.
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