[ydant]

Pretty standard for anyone who follows anything about advertising:

- CPC = Cost Per Click

- RPM = Revenue Per Mille (revenue per thousand impressions)

Both the C and R are sometimes used interchangeably - e.g. "RPC" and "CPM" mean roughly the same thing. It really just depends on which entity and which way the money's flowing if you think of the players in an advertising game:

[advertiser] -> [advertising platforms - e.g. Google] -> [publisher / traffic source]

One player's cost is another player's revenue.

[bootload]

thx @ydant, never heard this before. Very nice way to describe the process.