What is the third type of the website structure?

The correct answer is Subdomains. In international SEO, the three primary website structures for targeting different countries or languages are: 1. Single domain (gTLD with language/country selectors): Uses a generic top-level domain (e.g., .com) and relies on internal navigation or IP detection to serve different content. 2. Subdirectories (gTLD with /country/ or /language/): Uses a generic top-level domain with folders like example.com/fr/ or example.com/de/. 3. Subdomains (country/language.domain.com): Uses distinct subdomains like fr.example.com or de.example.com. "Subfolder" is synonymous with "subdirectory" and not a distinct third type in this context.