PPC is part of Search engine optimization further can be classified as search engine marketing and later on pay per click. When a website appears in search result on the basis of quality guidelines and appears in search result by satisfying algorithm of a search engine is called organic result. In ppc advertiser pays to website owner for the clicks made on the ads at publisher website.
1. PPC can be done by two ways, appearing in search result placing website ad at the ad section in search result page.
2. Putting ads on websites similar you may watch at the top and right hand side here