Both Organic SEO and PPC are part of Search Engine Marketing (SEM) which is one of the tools you can use as part of your overall Internet Marketing campaign.
I will try to explain the other major differences between the two by using the following parameters: position in search results, cost, traffic potential, conversion and ease of use.
Organic Traffic vs. Paid Search Advertising
Position in Search Results
As you can see from the screenshot above you can expect to find PPC ads above the organic results and on the sidebar. Where exactly your ad will appear depends on a number of factors (i.e. the keywords you are targeting, keywords in your ad copy, keywords in your landing page and many more) but it’s either on top, on the sidebar or below the organic results.
Organic SEO results can only appear in the middle of the page. Whether your listing will appear in the top positions or first pages this depends on how optimised your web site is both in terms of on-site and off-site Organic SEO.
Organic SEO: You can get first page positions if your web site is optimised for search engines
PPC: You can get your ad on the first page by paying a higher cost per click (CPC)
I have mentioned above that Organic SEO traffic is free and PPC is paid and while this is absolutely true, you should understand that it needs a lot of effort and hard work to get free traffic from search engines. The competition is high for almost every keyword you can search and you really need to have a high quality web site and a great Organic SEO plan to get one of the top 5 positions. There are no shortcuts despite what some “SEO” companies are trying to sell you. If you are not familiar how search engines work or don’t know anything about Organic SEO then the best way to get search engine traffic is to hire a SEO expert to do the work you.
On the other hand, Pay Per Click cost depends on a number of other factors. If we take for example the cost per click of advertising with the most popular PPC system, Google Adwords, then it depends on the popularity of the keyword, on the number of advertisers who want to use the particular keyword, the number of related web sites that have ad positions for the particular keyword and many more. If it sounds a bit complicated then it probably is despite the efforts made by Google to make the whole system easier to use.
The good news with PPC is that you only pay for the clicks your ad receives and not for the views. In addition, you can determine in advance your daily budget and pay no more than that and you can calculate an estimate of what is the average cost per click for the keywords you want to target. As you can see from the screenshot below the Google Keyword tool (which is part of Google Adwords) gives you an estimate for the CPC (cost per click) for each keyword.
Organic SEO: Cost of Organic SEO is indirect. You cannot pay to get to the first page but you may have to pay for Organic SEO services if you cannot do Organic SEO yourself.
PPC: You pay only when people click on your ad. You can use the Google keyword tool to calculate how much you can pay.
Which method can bring more traffic to your web site, Organic SEO or PPC? Organic SEO is more than PPC traffic so if you can manage to rank your web site for the keywords you want, you will get much more traffic than paying for those keywords. This is because when you are in one of the top 5 positions (according to statistics the majority of search traffic visits one of the top 5 web sites) you can expect to have a continuous flow of traffic 24×7 without having to pay anything (the actual volume of traffic depends on how popular a keyword is).
So, if you compare traffic and cost of first page positions for Organic SEO traffic and PPC traffic, organic traffic is better. There are some studies suggesting that PPC ads get more clicks than organic but this also translates to a bigger cost.
If on the other hand it is very difficult to get first page positions for a keyword then paying for traffic may be your only option since second and third page positions will probably bring 0 or very little traffic.
Organic SEO: Organic traffic is continuous as long as you are ranking in one of the top positions.
PPC: PPC ads can get more clicks but this means that you pay more.
Which visitor is more likely to convert (i.e. make a purchase, register to a newsletter and in general response to call for action), someone coming from PPC Ads or from organic search? If your ads are highly targeted and optimised then a visitor from PPC is more likely to convert than a visitor coming from search.
The reason is that a web page can rank for different keywords (other than those initially intended) so the search visitor may not be looking exactly for the content (or product) presented in the particular page. On the other hand if you run a successful PPC campaign then you will only get clicks from visitors who are interested 100% in your content or products.
Organic SEO: Organic traffic is better than other forms of traffic (i.e. social media) but in terms of conversion is not as good as PPC traffic.
PPC: Highly optimised keywords will generate more conversions but will cost more.
Ease of use
Neither Organic SEO nor PPC is easy to do if you don’t have the necessary knowledge and experience. Organic SEO is a process that takes a lot of time and effort. It may take months or even years to rank for specific terms or not rank at all!
On the hand, in order to get some good results with PPC and Adwords you either have to take a course or hire a PPC expert to help you or you will lose a few hundred dollars before you understand how it works.
The bottom line: PPC first and then Organic SEO
The bottom line is that you need to use both PPC and Organic SEO as part of your Internet Marketing campaign. PPC can bring you faster results so you can run a PPC campaign and test which keywords convert better and then try with Organic SEO to rank for those keywords.
Use PPC when you have a high converting product and use Organic SEO when you have a limited budget to spend on advertising.
Organic SEO may take time but the results are (under some conditions) long lasting while with PPC when you stop paying for clicks, traffic will also stop.