If you're thinking about using a copywriter (or becoming one), it's important to realise that there is more than one type of copywriting and several kind of copywriter.
Different writing tasks require different skills, and writers evolve different skillsets, whether deliberately or just as the organic consequence of their operating experience. Therefore the conditions 'copywriting' and 'copywriter', although simple-sounding, actually encompass a range of specialisations and capabilities. This post lists some of the most common types of copywriting and copywriters.copywriting
Note that some of these copywriting disciplines have parallel work titles/descriptions, and others don't. For instance, while 'SEO copywriter' is currently a recognised work title, I've never heard anyone describe themselves as a 'long-copy copywriter'. Also, be aware that a few of these labels are versatile - while there will vary strands within copywriting, the distinctions between them aren't generally so clear-cut as my headings imply, and folks could use these terms in different ways.
The freelance copywriter
The freelance copywriter writes in virtually any medium directly for clients, usually operating as a sole trader or one-person company.
Businesses and organisations require a broad selection of factors written: websites, brochures, case studies, item descriptions, user manuals, press releases, presentations, internal documents and more. While many only will use internal reference to find the writing completed, many change to a freelance copywriter to help them out.
Freelance copywriting is normally managed on an random, job-by-job basis, even though some clients do strike retainer arrangements or create longer agreements with freelances. Typically, the freelancer provides a price or proposal, does the task, revises the duplicate in response to feedback, and submits their invoice on approval.
Freelance copywriting typically requires 'broad but shallow' copywriting abilities. For example, throughout writing a corporate website, the copywriter will dsicover themselves writing lengthy copy for info pages, snappy selling duplicate for high-profile webpages and journalistic copy for news pages. Simultaneously, they might throw in a company tagline as well as perhaps name something range or two - in some cases, without even being asked, because the client might not have realised that they also need these exact things.
Due to working for many different customers, the freelance copywriter also tends to develop broad but shallow understanding of different business sectors, allowing them to get a handle on new customers' requirements very quickly. This is one region where older freelancers can consistently outdo their youthful counterparts - experience can't be faked, nor bought.
Conversely, some freelances specialise on paper for a particular industry or sector - pharmaceuticals, charity and so forth. This may be because they previously held a salaried placement in that sector. It could be a deliberate choice, or it could just emerge as a result of the careers and referrals which come along.