call to action (CTA) – the part of a marketing message that attempts to persuade a person to perform a desired action.
conversion rate – the percentage of visitors who take a desired action.
Google Checkout – an online payment system powered by Google, where users save their credit card information in their Google account so they can quickly perform online purchases in participating sites.
PayPal – an online payment service that lets its users make purchases and receive payments via a user-defined email address.
shopping cart – software used to make a site’s product catalogue available for online ordering, whereby visitors may select, view, add/delete, and purchase merchandise.