Oracle could refer to any of these :

Oracle - a person who makes predictions based on a claimed connection to the Gods.

Oracle Corporation is a database software company.
Oracle database is its popular database product.
See Oracle machine for the "oracle" in theoretical computer science.
The Internet Oracle is an attempt at collective humor that operates through email.
"The Oracle" is the name of a character (played by Gloria Foster and Mary Alice) in the Matrix series.
The Monmouth College Oracle was formerly the student newspaper of Monmouth College in Monmouth, Illinois. It was succeeded by the Monmouth College Courier.
ORACLE was also a teletext service on ITV. It was replaced by Teletext.