A database structure that organizes data in a parent-child relationship; all the relationships among the data items must be determined during the design phase. In a network structure, a child can have more than one parent or no parent at all.
An organization method that allows information relationships to be expressed.
A database organization method that allows for data relationships in a net-like form. A single data element can point to multiple data elements and can itself be pointed to by other data elements. Contrast with relational database.