The IR system was the component in the system that located a document to satisfy a given query that a user would create. The paradigm consider that the user query presented to the system was in the form of a template that started with “I want a document that contains…” and then the user would type a list of words and perhaps some parameters that provided a semantic relationship among the words. These parameters would be BOOLEAN (such as AND, OR, NOT) or distance (as how physically close two words should be), or indicate that synonyms or other semantic expansion should be used, etc. The system would then identify a document, or several documents that matched the query and possibly present them in a type of ranking order.
The only difference between an IR system and a search engine is the name, and may be also some of the document processing functionality.
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