Sub-domain & Sub-directory are two most common term in the world of web-hosting. Sub-domain & sub-directory empowers you to add more functionality to your website. For example you can have a forum or blog at sub-domain that would be like:
- forum.domain.com
- blog.domain.com
- domain.com/blog
- domain.com/pro
- Root domain: Domain.com
- Sub-domain: forum.domain.com (A sub-division of a domain name)
- Subdirectory: Domain.com/directory (A folder below your root domain)
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