difference between a Composite Index and a Covering Index

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what is difference between a Composite Index and a Covering Index?
please give example that you must use Covering Index and you can't use Composite Index instead of that.
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Posted 22-Feb-10 1:52am

mehran.h

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Ahmed A. Yassin · Answer 1 · 2010-02-22T02:39:00

Composite index: An index that contains more than one column. In both SQL Server 2005 or higher, you can include up to 16 columns in an index, as long as the index doesn’t exceed the 900 byte limit. Both clustered and nonclustered indexes can be composite indexes.

Covering index: A type of index that includes all the columns that are needed to process a particular query. For example, your query might retrieve the FirstName and LastName columns from a table, based on a value in the ContactID column. You can create a covering index that includes all three columns.

for more detailed explanation, see below links

http://msdn.microsoft.com/en-us/library/ms188783.aspx

Hope this breife explaniation will meet your requirment......