What is PPC and CPA ?

PPC stands for Pay Per Click, is a very popular advertising method on the internet. The ads is presented as a sponsored links in text form.
You will place this links on your website or blog. Whenever a visitor clicks on this links, the advertiser will pay you.

The more traffic to your site, the more visitors will see this links and click it.

Here is an example.
Let's say there is a company wants to launch a new product. They create an offer where they agree to pay $0.25 for each person who would bring person see their produck. Then Your job is to direct traffic to that company's site (using the links given by that company) and then collect $0.25 for each person who clicked the links on your site.

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CPA stands for Cost Per Action, is another popular advertising method on internet. You will get paid once a visitor clicked the links on your site and did an action.

The term "action" here could be as simple as filling out a form or signing out a free trial for a product.

Here is a basic example.
Let's say there is a company wants to conduct the consumer feedback on a new product that they are introducing. They create an offer where they agree to pay $1.00 for each person who submits their e-mail address and zip code. Then Your job is to direct traffic to that company's site and then collect $1.00 for each person who submitted their email address and zipcode.