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bgp - downstream and upstream peers

This should be an easy one.
When dealing with BGP, anyone have a  good explanation to understand the concept of downstream peers and upstream peers?
It can be confusing when you're studying and they mention these terms.
2 Solutions
An upstream peer is someone who is sending you routes who is closer to the "heart" of the internet than you. In other words, a backbone ISP is upstream to a regional ISP, who is upstream to a customer.

A downstream peer is someone who is receiving the routes you've sent, which could include your own routes and those of your upstream peers which you are passing on.

Adding to Mike's input, I would also say that typically an upstream peer you speak eBGP with
and a downstream peer you speak iBGP (external peer vs internal peer). Generally this is true but not true in all cases.

harbor235 ;}

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