PPC is the type of advertising that you do with adwords. And CPC is the amount you pay for click on your ad.

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PPC Pay-per-click: which means if someone clicks on your website's keyword on Google,you have to pay to Google.

CPC Cost-per-click: In Cpc,if someone click on your website,you will earn some $$$$.

Very Simple and specific.

PPC and CPC are often used interchangeable within the advertising community, however generally speaking PPC is used to describe the type of advertising program you are running. CPC, which stands for cost-per-click, is usually used in communicating what you are actually paying per click within your advertising program. To use appropriately in discussion you may say, "We want to run a PPC Advertising Campaign with Google and we want to average our CPC at $0.75." The CPC cost is set by a Bidding process.

PPC means pay per click (method of payment). PPC is a type of advertising, provide direct traffic to the website.
CPC means cost per click. It is the amount of money that publisher pay if someone click on your ads or website.

Pay per click= PPC
Cost per click = CPC