Copywriting is the art of writing scripts using power words to
deliver promotional messages.
and here are great resources:
Copywriting 101: An Introduction to Copywriting
http://www.copyblogger.com/copywriting-101/
Tips for effective SEO copywriting
http://www.doubleurincome.com/tips-for-effective-seo-copywriting/
hope you enjoy it
Ghada
Idea or Act copywriter (the advertisement composer) has in
wording / slogan for client (can be products / service)