Copywriting is mainly about writing that promotes generally in advertising. It is professional writing in that it is directly paid so it is a job that people work on. Copywriting is generally short and meant to be persuasive, punchy and memorable.
It can make money like anything else, if one is successful and has a good reputation. Nonetheless, it is somewhat of a volume business. Unlike an author who may write several to several dozen books in a lifetime, a copywriter probably does this in a month or two. Nonetheless, it requires skill and experience to become good at it.
The most common way to enter the profession is to join an advertising agency. Copywriting is generally seen as an “entry level” role in a large advertising agency.
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