The systematic process of gathering and classifying data so that it can be located and shown on demand is known as information storage and retrieval. Computers and data processing techniques have made it feasible to retrieve vast amounts of data quickly and selectively for government, commercial, and academic applications. Information storage and retrieval systems can be divided into various categories. Document retrieval systems hold whole documents, which are often retrieved using the document's title or key words. The text of documents is kept as data in some systems. This allows for full text searching, allowing for retrieval based on any words in the document.