Retrieval is the process of accessing and obtaining information from a storage system, such as a database or memory. It involves searching for specific data or documents based on certain criteria, allowing users to find relevant information quickly and efficiently. This process is essential in various fields, including computer science, library science, and information management. In the context of computer science, retrieval often refers to techniques used in search engines, where algorithms help locate web pages or files that match user queries. Similarly, in library science, retrieval systems help patrons find books or articles using catalogs and indexing methods.