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PostgreSQL
SQL stands for "structured query language". It describes a database program — a program whose only purpose is to store spreadsheets of data and provide ways to collect, update and access that data.
There are many SQL programs out there. The most popular is mySQL (www.mysql.com) for its ease of use. But Tortus Technologies uses PostgreSQL (www.postgresql.org) for its quality. Simply speaking, PostgreSQL is a more mature SQL program. It is more intelligently designed, has more features, and is intended for use in higher-end systems.
However, Ruby on Rails is perfectly content connecting to data stored in mySQL and several other database applications. If your company has a preference or an already existing database, Ruby on Rails makes it possible for Tortus to accomodate many database programs with no additional overhead.