What is a database management system? Discuss each of the five important software components of a database management system. Database management system (DBMS) is computer software installed on the system's hard drive that catalogs, retrieves, and queries data. It provides means for data to be modified or deleted by users or other programs. There are several types of database management systems created for the proper control of databases for specific purposes. The five software components of a database management system are the DBMS engine, data definition subsystem, data manipulation subsystem, application generation subsystem and data administration (Cummings, 2010). The engine of database management systems is the core component of the DBMS it stores and retrieves data, it accepts logical requests from several other subsystems and transforms them into its physical equivalent. The DBMS engine collects logical requests from data users and issues physical input/output requests to the computer's operating system. The requested data is collected from physical storage and, although the data remains in memory, it is managed by the DBMS engine. The data definition subsystems create and maintain a data dictionary. Define the file structure in the database. Its logical structure must be defined before information is entered and whenever information is entered or deleted, the data definition subsystem must be used. Field name, type, form, default value, validation rule are required input and may there be duplicates are examples of logical properties (Cummings, 2010). The data manipulation subsystem is used to add, modify and delete information in a database. There is software in the middle of paper...... high-performance products. Some examples are the nanotubes that have been added to the frames of tennis rackets and golf clubs. Nanotubes are among the strongest materials known to man. Since these tubes are microscopic, millions can be added to the tennis racket to make it strong to give tennis players more control and power. Medicine is another area where nanotechnology is transforming. While the medical field deals with things at the smallest level, small nano-devices are being developed to enter the body. An example is the nano robot which is a computer-controlled robotic device used to treat and eradicate diseases. Nanotechnology differs from traditional manufacturing in which traditional manufacturing takes a large object and breaks it down to its smallest form, nanotechnology starts at the smallest form and builds upwards (Cummings, 2010).