This is how search engines categorize hanseranking

Search engines are programs. These can be built up in different ways or. program. The following characteristics categorize a search engine. Act largely independently of each other.

Differentiation by types of data

One of the characteristics by which search engines can be categorized is the type of data that is searched by a search engine. The data can be roughly divided into different types of documents. There are search engines for text content, images, videos and sound recordings such as music. Depending on the type of search engine, different lists of results are generated.

With a
Text search engine short excerpts of the respective texts are displayed to the user, these excerpts are called snippets.

At Image search engines the result lists look different. Here you can see a thumbnail of many images matching the entered search term.

The results of a Video search engine differ again from those of a text search engine or an image search engine. After the input of a search word a result list with suitable videos is generated to the user.

Categorization by data source of the data captured

Another feature used to categorize search engines is the data source from which the search engines collect the data. A distinction must be made here:

Web search engines: These search engines capture data from the World Wide Web.

Vertical Search Engines: Vertical search engines collect documents on a specific topic, such as health or law. Vertical search engines look at a selected area of the World Wide Web. These types of search engines capture data. Contributions from the globally distributed discussion medium Usenet. Usenet is the oldest network for exchanging messages and files.

Intranet search engines: Intranet search engines are limited to the collection of data from the computers of an intranet of a company. An intranet is a non-public computer network and is often used in organizations, companies or government agencies and is available as an information, communication and application platform.

Enterprise search engines: Enterprise search engines are company-internal search engines, which are optimally adapted to the individual requirements of a company. These search engines enable centralized searches across multiple data sources within an organization, such as.B. File servers, wikis, databases and intranets.

Desktop search engines: Desktop search engines are programs that search the local database of a computer.

Categorization according to the implementation of the operation of a search engine

Another feature is the way in which the operation of a search engine is implemented. This feature refers to how the search engines acquire data, analyze it, and then display relevant results to the user.

Index search engines

The most common search engines today are called index search engines.

The information retrieval in index search engines is realized by so-called "crawlers", "spiders" or "robots". These programs analyze documents and try to extract the essential information or keywords. The documents are then stored in databases. Index search engines evaluate the indexed documents only automatically.

This offers the advantage that a very large amount of data can be indexed and the search process itself is carried out quickly.

The indexing of data and the maintenance of the database is very time-consuming, as information sources must be constantly searched so that the search engine is always up to date.

Meta search engines

The difference between an index search engine and a meta search engine is that meta search engines do not have their own index, i.e. meta search engines do not have their own database.

If a user makes a search query with the help of a metasearch engine, the search engine accesses the databases of various other search engines instead of its own index. The metasearch engine thus performs a so-called metasearch. This metasearch happens when the metasearch engine forwards the search query to several search engines in parallel.

The results of the normal search engines are collected by the metasearch engine and displayed in a list of results. Duplicate entries from different search engines are automatically removed.

The disadvantage of these meta-search engines is that the search time is quite long due to the large number of simultaneous queries.

The meta search engines are well suited for a search for rare and special terms, if previous search queries with individual services were fruitless.

Hybrid search engines

In addition to the index search engines and the meta search engines, there are also so-called hybrid search engines.

hybrid search engines have their own index, but it is very small, so these search engines also send queries to other search engines and then combine them in the results lists.

Hybrid search engines, also called real-time search engines, start the indexing process only after a query has been made. Thus the found sides are always current.

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