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An '''abstracting service''' is a service that provides abstracts of publications, often on a subject or group of related subjects, usually on a subscription basis. An '''indexing service''' is a service that assign descriptors and other kinds of access points to [[document]]s. The word indexing service is today mostly used about computer programs (see [[indexing service]]), but may also cover services providing [[back-of-the-book index]]es, journal indexes and related kinds of indexes (see [[index (publishing)]]. An '''indexing and abstracting service''' is a service, that provides shortening or summarizing of documents and assigning of descriptors for referencing documents.
The product is often an '''abstract journal''' or a [[bibliographic index]], which may be a subject bibliography or a [[bibliographic database]].
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