If you have a small business website, or if you have started a site for search engine marketing, you will likely be using search engine optimization in order to target people who are searching for the product or service available on your site; while this is a great start to driving traffic your way and making money as a result, you should also realize that there are a few more things you should pay attention to in order to make sure this traffic turns into sales - namely, the way the buying cycle works these days. There is a high percentage of consumers who will head to the Internet these days when there is a product they are thinking about buying (especially a product that will cost a decent chunk of money - which is where your focus should be, especially if you are a search engine marketer), and when they go online, the first thing these people are likely to do is compare the specs on different products; while it is fine to bring traffic your way at this point, one thing you should also realize is that you are unlikely to convert this particular traffic into profits! The reason you are going to have a hard time turning this traffic into profits is because most people will move from this point to A) asking friends (perhaps on Twitter and facebook) for opinions on the products they have looked at, and B) looking up reviews of these products; this is another big spot in the buying cycle that a lot of people target on their sites, but it is not a big part of the buying cycle for actual sales!
Finally, you are going to arrive at the end of the buying cycle, when consumers will be searching keywords such as "best deals on" the particular product, or "best prices on" the product in question; because this is the part of the buying cycle when the most sales are going to be made, this is the part of the buying cycle you will want to aim to target in your keyword approach, as this will bring you the highest conversion rate!
If you want to make money on your website, bringing lots of traffic your way will be important, but another aspect that will be just important is converting this traffic into sales - and when you understand the buying cycle, you will be well on your way to doing this!