Intranets and extranets are examples of:

Intranets and extranets are indeed examples of vertical portals. Vertical portals, also known as "Vortal," focus on a specific industry or area of interest, providing resources, information, and services tailored to that niche. An intranet is a private network accessible only to an organization's staff, designed to facilitate internal communications and access to specific resources. In contrast, an extranet extends certain controlled access to partners, vendors, or clients, allowing them to interact with the company in a secure environment.

This type of portal focuses on delivering specialized content and tools that meet the specific needs of a target audience, whether internal employees or external partners, highlighting the tailored nature of their services as a characteristic of vertical portals.