A database is a data structure that stores organized information.
Most databases contain multiple tables, which may each include several
different fields. For example, a company database may include tables
for products, employees, and financial records. Each of these tables
would have different fields that are relevant to the information stored
in the table.
Nearly all e-commerce sites uses databases to store product inventory and customer information. These sites use a database management system (DBMS), such as Microsoft Access, FileMaker Pro, or MySQL
as the "back end" to the website. By storing website data in a
database, the data can be easily searched, sorted, and updated. This
flexibility is important for e-commerce sites and other types of dynamic websites.
Early databases were relatively "flat," which means they were limited to simple rows and columns, like a spreadsheet. (See also "flat file database").
However, today's relational databases allow users to access, update,
and search information based on the relationship of data stored in
different tables. Relational databases can also run queries that
involve multiple databases. While early databases could only store text
or numeric data, modern databases also let users store other data types such as sound clips, pictures, and videos.
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