Search Architecture Terminology

Index Engine - processes the chunks of text and properties filtered from content sources, storing them in the content index and property store.

Query Engine - executes keyword and SQL syntax queries against the content index and search configuration data. 

Content Index - stores information about words and their location in a content item.

Property Store - stores a table of properties and associated values. 

Search Configuration Database - stores information used by the Search service, including crawl configuration, property schema, scopes, and so on. 

Wordbreakers - used by the query and index engines to break compound words and phrases into individual words or tokens.