What is the difference between PPC and Google Adword?

Google Adwords is an advertising tool that allows you to target individuals who are already looking for the types of products and services you sell.
PPC, is an advertising technique used on websites, especially search engines. Pay per click advertisements are usually text ads placed near search results.

you bid on certain key words, so that they show up as paid listings when a person types them into a search engine.
Google AdWords is a pay-per-click advertising program by Google. With AdWords, advertisers can promote their website's products and services on Google.