Information retrieval is the science of searching for documents, for information within documents, and for metadata about documents, as well as that of searching relational databases and the World Wide Web. There is overlap in the usage of the terms data retrieval, document retrieval, information retrieval, and text retrieval, but each also has its own body of literature, theory, praxis, and technologies. IR is
Human-Computer Information Retrieval Lecture
Knowledge-based Information Retrieval with Wikipedia.
Brazil (Terry Gilliam, 1985) - Information Retrieval
Efficient and Flexible Information Retrieval Using a...
The Future of Information Retrieval Part 1
The Future of Information Retrieval Part 2
Information Retrieval Course Example
MGS: The Monkey Gear Incident - EP1 - Information Retrieval