What is a web site that indexes information in a specific field called?

A website that indexes information in a specific field is referred to as a vertical search engine. This type of search engine focuses on a particular niche or industry, allowing users to find information that is more relevant and tailored to their specific interests compared to general search engines.

Vertical search engines concentrate their resources and algorithms to deliver content that is pertinent to a specific subject matter, such as healthcare, legal information, real estate, or travel. This specificity helps users navigate a vast amount of data by providing them with curated results that align with their queries, improving the efficiency and effectiveness of their search experiences.

In contrast, general search engines attempt to cover a vast array of topics, making them broader but potentially less focused. A social media platform serves a different purpose, often oriented towards social networking and content sharing rather than indexing information. An information repository may store and manage data, but it does not specifically imply the indexing and specialized search functionality characteristic of a vertical search engine.