(i) Integrated database: Integrated database means union of several otherwise distinct data files, with any redundancy among those files partially or wholly eliminated.

(ii) Shared database: Sharing of data means that individual pieces of data in the database may be shared among several different users, in the sense that each of those users may have access to the same piece of data and each of them may use it for different purpose. The database which contains this type of data is called shared database.

(iii)  View: A view is a pseudo-table or virtual table. It displays the data. The data is derived from one or more base tables.

(iv) Database system:  A database is a collection of interrelated data and a database system is basically a computer base recordkeeping system.

(v) Data security:  Data security refers to protection of data against accidental or intentional disclosure to unauthorized persons, or unauthorized modification or destruction.

(vi) Data integrity:  Data integrity refers to maintaining and assuring the accuracy and consistency of data over its entire life cycle