How direct advertising helps bring more traffic

There are two kinds of advertising one can use in a website or a blog. Signing up any Advertising Publisher network ( Google AdSense, Yahoo Publisher Network, AdBrite etc.) and then use their advertising is one, while the other is advertising a product or service directly. In the first case, blogger earn when a blog visitor clicks any advertisements or some advertising publisher network may pay for number of impressions. But in a direct advertising, one gets payment for putting the advertisement banner according size, shape, duration and location of the ad. And normally it is paid upfront. While in case of APN, they payment is made after a period of time, say one month, if certain amount is accumulated in terms of ad-click revenue.

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How direct advertising helps bring more traffic