Difference between oracle Data Guard and Replication

Hello Friends,
I would like to know the main difference between oracle replication and data guard. Theoretically both are same then where is the difference. Can replication or dataguard be configured in a single PC.
Thanks

Dataguard :
Oracle Data Guard is primarily for high availability, data protection, and disaster recovery. An Oracle Data Guard Standby instance provides transactionally consistent copies of the production database, in the event of an unplanned outage or instance maintenance the Data Guard Primary Role Standby Role can be switched so the Standby instance can provide Production services.
Replication :
Oracle Advanced Replication and Oracle Streams are Oracle's solution for replicating data and internal structures to remote databases. Advanced Replication is primarily trigger based where Streams is a rule/handler based replication process and considerably more efficient and less error prone than Advanced Replication
refer,
http://www.xtivia.com/database-management/replication/oracle-replication
Thanks

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