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What does "first-mile" mean in outbound messaging?

When using middleware, outbound messaging becomes a “first-mile” guarantee of delivery.
What does that mean? Can someone explain with a scenario?
SwethaSwetha (Salesforce Developers) 
HI,
Can you share the source of this statement? Is there a related salesforce article?It will help understand the context better. Thanks 
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Shwetha, 

Please check outbound message in the below link. 

https://developer.salesforce.com/docs/atlas.en-us.integration_patterns_and_practices.meta/integration_patterns_and_practices/integ_pat_remote_process_invocation_fire_forget.htm