The text you write for promotional materials such as ads, tagline, sales pitch, etc. are normally referred to as copies. Copywriting is basically writing to promote and market something. If you are a marketer or a business, you need copywriting skills. Well, you can of course hire a copywriter, having skills will always put you on advantage. To be able to write a good copy, you need to have language and writing skills. You need to have know ledge on various writing tools like puns, rhymes, alliterations, etc. Copywriting is comparable to writing poetry because you need to know how to convey a lot of things with fewer words. Your copies should create pictures and make people imagine things.