Call to action buttons prompt your visitor to communicate to you via chat, a contact us form, an email or a phone call. It can also prompt your visitor to take a particular action to learn more about your company and the services you offer. For example, a free PDF, adding to your mailing list or even signing up for a free sample.
What call to action buttons you use, as well as where you put them is key to converting your visitors into hot prospects.
Here is a good example of well placed call to action buttons on a website we optimized recently.