seo'n is a process of enhancing the code and content of the webpages that make up a website, so that it may reach the highest ranking for the keywords and subject matter in comparison to other websites with related content, within a search engine (google).
ppc refers to the amount paid when a visitor "clicks" on a link displayed on a parked page associated with a specific domain name.
"parked page" refers to domain parking, in which you set the dns of your domain to the nameservers of a specific PPC provider (sedo.com).
they in turn will supply the webpage and the content/links, which will/should match the keywords/subject of your domain.
any earning generated are paid to you, minus their cut