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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chapmandewCommented:
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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."

Check out this article:
http://sqlserverpedia.com/wiki/Latches_-_Introduction

Also check this:
http://www.experts-exchange.com/Database/Miscellaneous/Q_21861698.html
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Microsoft SQL Server 2005

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