Which is the difference between Oracle RAC and Oracle Clusterware?

Hi all, maybe this is a stupid question, but I've read the documentation, and still don't understand which is the difference between RAC and Clusterware.
Can anybody explain it to me?
Thanks in advance!

RAC is database option part of Oracle Database software needed to have database running in cluster mode; see http://download.oracle.com/docs/cd/E11882_01/server.112/e16508/glossary.htm#CNCPT2076.
Clusterware is separate software needed to run Oracle Database in cluster mode: you can use Oracle Clusterware without Oracle Database but you cannot use Oracle Database with RAC option without Oracle Clusterware.
See http://download.oracle.com/docs/cd/E11882_01/rac.112/e16794/intro.htm#BABCHEEE.
Edited by: P. Forstmann on 19 nov. 2010 19:11
Edited by: P. Forstmann on 19 nov. 2010 19:11

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