The portal business model was born with the Internet. The number and use of these portals is growing along with the number of products they offer. The framework of the business must be flexible because the industry is highly volatile and sees nearly constant change.
Portal business models provide entry to content or services on the Internet. Search engines are portal business models that include many kinds of content and services. They are profitable for advertisers because they draw a large amount of user traffic. Many offer the user ways to customize their interface making the portal even more alluring.
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What Is a Portal Business Model? | Chron.com.