|Natural Language Processing|
Information retrieval (IR) deals with the representation, storage, organization of, and access to information items. Given a query the goal is to extract a subset of documents from a large data collection that satisfies a user's information need. Besides written texts the database may also contain multimedia documents, e.g. audio and video data.
In natural language understanding, the objective is to extract the meaning of an input sentence or an input text. Usually, the meaning is represented in a suitable formal representation language so that it can be processed by a computer.
The goal in text classification is to assign a text document to one out of several text classes. For newspaper articles, such classes are sports reports, finances, and politics.