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"out-of-sequence" messaging and callbacks mitigate retrieving more data in outbound messaging, kindly explain to me?

Callbacks in outbound messages provide a way to mitigate the impacts of out-of-sequence messaging. 
1. What is out-of-sequence messaging? could someone give me an example to better understand?
Retrieving more data—A single outbound message can send data only for a single object. A callback can be used to retrieve data from other related records, such as related lists associated with the parent object.
2. Could someone give me an example of pulling related lists in the callback with an example? 

Thank you
VinayVinay (Salesforce Developers) 
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