Loose ends
What is a Network?
When you advertise with AdWords, you’ll be showing your ads on one or
both of Google’s advertising networks: the Google Search Network and the
Google Display Network. The network setting determines which of these
networks your campaign’s ads will appear on and the types of ad formats
that you can use.
What is a bid?
When you select each keyword, you can choose how much you're willing to
pay when a customer searches on that keyword and clicks your ad. This is
your keyword's maximum cost-per-click, or max CPC, bid amount.