Complete Oracle System (Instance & Database) Design: Steps of Implementation - Oracle 10g Database Administration Concepts and Implementation Made Simple - page 145

Once you have installed the software successfully then next step
would be to create the database which we would be studding in
the next chapter.
Things to Remember Before Moving Ahead
1) Different Editions of Oracle Software: Enterprise
Edition, Standard Edition, Standard Edition One,
Personal Edition, Oracle Lite.
2) Licensing based on Users or Number of Processors
(CPUs: Central Processing Unit).
3) Oracle Universal Installer (OUI) works the same way
both in Windows and UNIX environment as it's a JAVA
based application.