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Relational Database (RDBMS)

A database based on the relational model developed by E.F. Codd. A relational database allows the definition of data structures, storage and retrieval operations and integrity constraints. In such a database the data and relations between them are organised in tables. A table is a collection of rows or records and each row in a table contains the same fields. Certain fields may be designated as keys, which means that searches for specific values of that field will use indexing to speed them up.

Where fields in two different tables take values from the same set, a join operation can be performed to select related records in the two tables by matching values in those fields. Often, but not always, the fields will have the same name in both tables. For example, an "orders" table might contain (customer_id, product_code) pairs and a "products" table might contain (product_code, price) pairs so to calculate a given customer's bill you would sum the prices of all products ordered by that customer by joining on the product-code fields of the two tables. This can be extended to joining multiple tables on multiple fields. Because these relationships are only specified at retreival time, relational databases are classed as dynamic database management system.

Source: Dictionary.com

Return on Advertising Spend (ROAS)

How much profit is generated per money spent on an advertising method.

Source: Overture.com

Return on Investment (ROI)

How much profit is generated per all money spent on a business.

Source: Overture.com

RSS

A family of document types (generally based on RDF) for listing updates to a site. RSS documents (generally called "RSS feeds") are readable with RSS readers (generally called "aggregators") like BottomFeeder, although, in 2003, it is anticipated that aggregator functions will be incorporated into web browsers and/or NNTP newsreaders.

Source: Dictionary.com

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