What's the difference between organic vs. paid results?

in a Google search of - What's the difference between organic vs. paid results?

http://www.dummies.com/how-to/content/the-difference-between-organic-and-paid-search-eng.html

Seems clear enough to me.

Mark

Organic search results are those which are optimised for search engines to make it reach more and relevant target audience. This process is particularly known as search engine optimization or SEO. Here, the major focus is given on targeted keywords and quality content, in addition to fine tuning the elements of on-page and off-page optimization. The position of every web page on SERP is determined by the search engine algorithm. The keywords entered by the user are matched with the keywords used on the web page and then a list of websites appear in front of the user.

Whereas, paid search results are type of contextual advertising where website owners pay an advertising fee, usually based on the number of impressions, clicks or the ad views. Paid search as a part of online advertising service and is done in order to rank the website on the top in SERP.

Hi,
Search engine optimizing a website to receive higher organic search engine results produces a better return on investment than paid search engine advertising
- Effective search engine optimization leads to higher organic search engine results
- Paid advertising can deliver immediate traffic but is costly and traffic to your website will cease once your budget runs out
- Over time, organic search result traffic to your website will continually increase if you continually conduct effective search engine optimization on your site.

Organic - All the result are free here and its depend on the google algorithm factors.
Paid- All the result are paid and depend the cost on per keywords while bidding.