Keyword research is the basic skill or task that you must master if you want to be at all successful in the business of internet marketing. The essence of marketing is getting customers to buy your product right? And what are the important parts of that task?
Well first you have to have a product. Preferably this product has some demand from the public that give it value. The public then has to know that they have the need that your product can remedy. Then they need to know about your product more than they hear about your competitor's product. How your product is the best that money can buy and all that yada yada. Because you have a limited supply of resources you have to make the most of your efforts which means that you try to target your marketing to the people that are most likely to buy once they have heard about it. On the internet things are a little bit different in that the main way to get your product in front of people, i.e. to get people to your sales page, is via the search engines. This is where keyword research comes in.
Search engines are really the portal for the customer to the internet whether that customer is after information only or to buy a product. They type in a keyword into the search bar and then based on the results will either refine the search further or click through links to get to what he or she is looking for. The general rule is that the higher the result is ranked by the search engine the more hits that link is going to receive. And since it makes sense the more traffic to a sales page the more sales you are going to get you want your page's link to be as high as it possibly can be on the search engine result page. Once again this is done in large part with good keyword research.
Keyword research is the first step in search engine optimization. You see although the search engine's formula is somewhat mysterious, it is not a secret that they base their ranking on the relevance of the page's overall content as it relates to the keyword that was searched. So it is first important to find the most common thing that people type into the search blank when they are looking to fill a need that your product will fill.