Who can tell me the difference between MDM,BW and ODS

What's the difference between MDM/BW/ODS,and what aspect/domain does each of them emphasize.

Thank Dirk,Anil for your wonderful answer.
After study these docs on sap.com and your reply,I have other questions to ask:
1. If I use MDM as a Enterprise's Data center repository,Is that mean I can give up other database such as Oracle,SQL Server,and build new application or shift those regacy non-SAP applications on MDM gradually,you know,if I retain these DB,I should syncharonize them cautiously,and it can not avoid "dirty data" between heterogeneous systems.
   Consider such a scenario,application A request data from MDM to modify,application B request the same data from MDM to query,then "dirty data" happened?
   So,I think if I use MDM as center data repository,then I should give up other DB,and these non-SAP systems should reference these data and deal its own business matter.
2.When I implement MDM,Would the data in SAP R/3(such as PM/MM/FI/CO) also be replicated to MDM,then shared to other non-SAP systems?or these data needn't synchronize to MDM?
3.consider such a scenario,I need SAP R/3 data to share with other non-SAP system,besides XI,should I need MDM,using MDM to implement data management and sharing.
4.Dirk has noticed "MDM could also mean Meta Data Model ",so I want to ask if MDM fully compatiable with CIM(common information model) and I can create complex objected-oriented data and mutiple relationship in it?
thanx for your answer again,Best regards
jiansen

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