So, you have downloaded your links profiles on a CSV and you now have an extensive list of all your linked domains. If you have been doing SEO for 8+ years like me you can probably just know from analysis which links are bad from a TLD and URL point of view. If you do not know too much you can use tools such as Link Detox: http://www.linkdetox.com/ to complete analysis of your link profile. I would always consult the advice of an expert SEO in this instance because it is easy for these tools to mistake good and bad links.
You may be wondering, why pay to show up in search engines and have people click on your website pages? Can’t you just improve your website’s SEO and get online visibility and organic clicks for free? The answer is that organic search isn’t actually free. SEO strategies are very beneficial to your business, but SEO takes time to take effect, (up to 6 months) and the tactics involve a lot of work toward producing quality content. With SEM/pay-per-click advertising, you see results right away, in the form of your business name on page one of a search.
Influencer marketing is a great way to expose your brand to a much larger audience, which often results in a significant spike in traffic that can lead to more subscribers, followers, and leads. It can also lead to long-term SEO improvement. In this session, you will learn how to leverage influencer marketing to drive organic traffic and rank your website higher.
Click through rates: Searches using terms that denote high purchase intent such as product or brand-specific keywords will get more clicks than organic results. The advantage of paid search can clearly be seen in the Internet retailers MarketLive Performance Index data. For the year 2013 as a whole, PPC accounted for 36.5% of search traffic but an outsized 47.9% of revenue from search.
Clients often ask me the difference and I give them a simple answer that normally puts an end to the conversation and their questions, much like the answer shane thomas gave, but less detailed.  Direct is people putting in your url in the top and organic is people searching for you.  Here is an example: If I want to buy a book i type in amazon.com (direct traffic) but if i forgot where to buy a book online i search for "where to buy a book online" which directs me to amazon.com (organic traffic).  When i explain it like this, a light bulb goes off and they understand.  Hope that helps.

Since there is an obvious barrier of entry for anyone trying to beat you once you’re established, you won’t have to worry about having competitors “buying” their way to the top. Their only option is pay per click ads, but then again, it isn’t the same as getting a higher position on the SERPs. Again, this is assuming that you took the right steps and were patient enough to solidify your place in the top search results. 
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Now, it is not that these sites are not interested in Google users. In fact, they have hired us to help them increase their share. However, they are getting so much traffic from sites like Facebook that it seems there is less urgency about attracting this traffic and less willingness to change the site to meet organic standards. Not long ago, sites would urgently and unquestioningly abide by Google’s standards to court that traffic.