Yahoo and Netscape's Net Center are two examples. Vertical portals are focused on a particular type of content or on specific categories of products or services. An intranet is often called an Enterprise portal. It is really a vertical portal that supports the internal operations of an organization. Portals sometimes provide users with customization and personalization features.
Users customize a portal to work the way they prefer.
For example a user might set various display options, or rearrange or eliminate content to customize a site.