What exactly is Copywriting? Copywriting is the art and science of writing copy (words used on web pages, ads, promotional materials, etc.) that sells your product or service and convinces prospective customers to take action. In many ways, it’s like hiring one salesman to reach all of your customers. A sales team contacts customers one at a time; a copywriter reaches all of them at once through billboards, magazine ads, sales letters, blog posts, and more.