PPC and Email Marketing both are different process for promote your website. Dissimilarity between both of them
PPC:
* Costly way to promote your business.. etc
* Promote your website in search engines
* Show your website in top results
* Pay for each click, lead, thousand impression.. etc
E-mail marketing:
* Cost effective way to promote your products, business.. etc
* You can send your advertisement personally
* Provide traffic for long time
* No need to pay for any visit