PPC – Pay-Per-Click
CPC – Cost-Per-Click
PPC is used to describe the advertising program that you are running. This helps businesses in getting a higher traffic on their website that will then help them in gaining a higher sum of money. It is said that Pay Per Click returns the best result.
CPC is used as a communication method i.e. it helps users know what you are paying to them for a click they make. Cost Per Click also helps in doing SEO as it sends direct traffic to a website.
Normally both CPC and PPC are used interchangeably.