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2. Domain Name System - Wikipedia

   en.wikipedia.org/wiki/Domain_Name_System

   t. e. The Domain Name System ( DNS) is a hierarchical and distributed naming system for computers, services, and other resources in the Internet or other Internet Protocol (IP) networks. It associates various information with domain names (identification strings) assigned to each of the associated entities.

3. AOL

   login.aol.com

   AOL is a leading online service provider that offers free email, news, entertainment, and more. With AOL, you can access your email from any device, customize your inbox, and enjoy a secure and reliable email experience. Sign in to AOL today and discover the benefits of AOL Mail.

4. Table (database) - Wikipedia

   en.wikipedia.org/wiki/Table_(database)

   Table (database) A table is a collection of related data held in a table format within a database. It consists of columns and rows . In relational databases, and flat file databases, a table is a set of data elements (values) using a model of vertical columns (identifiable by name) and horizontal rows, the cell being the unit where a row and ...

5. Basic direct access method - Wikipedia

   en.wikipedia.org/wiki/Basic_direct_access_method

   Basic Direct Access Method, or BDAM is an access method for IBM's OS/360 and successors computer operating systems on System/360 and later mainframes. BDAM "consists of routines used in retrieving data from, and storing data onto, direct access devices ." [1] : p.5 BDAM is available on OS/360, OS/VS2, MVS, z/OS, and related high-end operating ...

6. Data hierarchy - Wikipedia

   en.wikipedia.org/wiki/Data_hierarchy

   Purpose of the data hierarchy. "Data hierarchy" is a basic concept in data and database theory and helps to show the relationships between smaller and larger components in a database or data file. It is used to give a better sense of understanding about the components of data and how they are related. It is particularly important in databases ...

7. Hierarchical database model - Wikipedia

   en.wikipedia.org/wiki/Hierarchical_database_model

   A hierarchical database model is a data model in which the data are organized into a tree -like structure. The data are stored as records which are connected to one another through links. A record is a collection of fields, with each field containing only one value. The type of a record defines which fields the record contains.