Search Engine Optimizing
SEO or Search Engine Optimisation is the name given to activity that attempts to improve search engine rankings. In search results Google™ displays links to pages it considers relevant and authoritative. Authority is mostly measured by analysing the number and quality of links from other web pages. In simple terms your web pages have the potential to rank in Google™ so long as other web pages link to them.
Paid Advertising
Paid advertising is any kind of advertising that you have to pay for, versus owned or earned advertising. With paid advertising, marketers pay the owner of ad space in exchange for use of that space. The price paid for the ad space is often settled through a bidding process between marketers and the ad space owner. There are several categories, including pay-per-click (PPC), pay-per-impression (PPI), and display ads.