locking and latching

I need to explain to lay people the difference between locks and latch waits.

ie latch being a mini lock .
can anyone suggest some good reference material I can refer people to?
Amanda WalshawBusiness Solutions AnalsystAsked:
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Raja Jegan RSQL Server DBA & Architect, EE Solution GuideCommented:
"Locks and latches are similar objects but they have a slightly different purpose. Locks ensure that the same data element cannot be modified by two different connections at the same time; latches, on the other hand, simply ensure that the data page on which the data element resides is physically readable and writable. A latch is only maintained on the data page while the data is being changed, as opposed to locks which are maintained for the duration of the entire transaction."

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Microsoft SQL Server 2005

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