Pay per impression programs pay you on the basis of the number of ads you show rather than any other criteria required from the users side, like clicks, signups etx. Pay per impression are the safest mode of advertisement. Which is :-
1. Cheaper for the Advertiser (since the rates are low but are less reliable)
2. Quite reliable for Publisher but low paying. Publishers dont have to worry about clicks or signups.
CPM : Cost per M Here, M=1000 (Roman Letter)
Since, calculation of Ads or no. of impressions delievered on per ad basis is difficult, Advertisers use the word CPM i.e. Cost per 1000 ads.
QUOTE
Some popular Web Definations for PAY PER IMPRESSION.
1. Stands for cost per thousand (the M is derived from the Roman numeral for thousand, which was derived from the Latin "mille"). The price an advertiser pays per thousand impressions or eyeballs. Frequently used in print, broadcasting, direct marketing, and online banner ad sales.
2. "Cost per Thousand." The dollar figure used to evaluate the cost to reach a thousand persons in a media buy. CPMs are calculated by multiplying the cost of an ad by 1,000, then dividing that number by the total audience. CPM = Cost x 1,000 - divided by total Audience.
3. Refers to the cost for an advertiser to send a message to 1000 receivers. The measure is calculated by dividing the amount of money spent for a given advertisement by the number of people exposed to it. (Based on this measure, signs are usually considered to be the least expensive form of advertising.)
1. Stands for cost per thousand (the M is derived from the Roman numeral for thousand, which was derived from the Latin "mille"). The price an advertiser pays per thousand impressions or eyeballs. Frequently used in print, broadcasting, direct marketing, and online banner ad sales.
2. "Cost per Thousand." The dollar figure used to evaluate the cost to reach a thousand persons in a media buy. CPMs are calculated by multiplying the cost of an ad by 1,000, then dividing that number by the total audience. CPM = Cost x 1,000 - divided by total Audience.
3. Refers to the cost for an advertiser to send a message to 1000 receivers. The measure is calculated by dividing the amount of money spent for a given advertisement by the number of people exposed to it. (Based on this measure, signs are usually considered to be the least expensive form of advertising.)
Way to go...