Oracle Corporation ( ) is one of the major companies developing database management systems (DBMS), tools for database development, middle-tier software, enterprise resource planning software (ERP), customer relationship management software (CRM) and supply chain management (SCM) software. Oracle was founded in 1977, and has offices in more than 145 countries around the world. As of 2005, it employed more than 50,000 people worldwide and is the world's second largest software company.

Lawrence J. Ellison (Larry Ellison) has served as Oracle's CEO throughout the company's history. Ellison served as the Chairman of the Board until his replacement by Jeffrey O. Henley in 2004. Ellison retains his role as CEO. Forbes magazine once judged Ellison the richest man in the world.

Ellison was inspired by the paper written by Edgar F. Codd on relational database systems named A Relational Model of Data for Large Shared Data Banks. He had heard about the IBM System R database from an article in the IBM Research Journal provided by co-founder Ed Oates, also based on Codd's theories, and wanted Oracle to be compatible with it, but IBM stopped this by keeping the error codes for their DBMS secret. He founded Oracle in 1977 under the name Software Development Laboratories. In 1979 SDL changed its name to Relational Software, Inc. (RSI). In 1983, RSI was renamed Oracle Systems to more closely align itself with its flagship product Oracle Database with Robert Miner as senior programmer.