I keep hearing about Call to Action
A call to action is a marketing term. In terms of websites it is a part of your site that is designed to prompt an immediate response encourage an sale. It can be a button, image or contain text that prompts the sites visitor to do something. Creating an effective call to action will make a difference in your sales or click-threw on your site. Some samples below.
When building your site, keep in mind what call-to-action you want your visitors to see