The term 'artist' could be applied to literally hundreds of totally unrelated, and VERY different, careers.
Someone doing crappy graphic design work in house for a corporation's advertisements, doing caricatures for fairs and corporate events, managing the graphics for a live broadcast, pouring through hours of footage for a reality television show to flag significant scenes, drawing pornography for degenerates online, creating assets for terrible mobile applications, painting murals for schools and businesses, selling your crafts online and at conventions, giving drunken housewives painting lessons, trying to stay awake in the control booth of a cruise ship theatre, working through the crunch animating for some terrible television series made for toddlers, composing a few seconds of music for a commercial selling car insurance, etc.
People think 'artist' and imagine someone in a jaunty beret painting nude models and being eccentric or cool, when the reality is more likely a fat young man alone at a computer reading emails about revisions, from some client with no taste or art training, and wearing a carpal tunnel brace.
For some reasons, kids think it's going to be fun and fulfilling working as a 'creative', and there are countless schools out there churning out thousands of graduates every year willing to work for literally nothing based on this delusion.
Later in your career clients will start coming to you and you'll have made enough connections to be contacted by colleagues when work comes up, but it's still feast or famine, and you never know if you'll be employed a year from today - you spend a great deal of time and effort looking for work, sending out your portfolio or demo reel, going to interviews, maintaining your online presence through social media, etc.
Studios and companies fold constantly, projects get cancelled half way through production, the grant or public funding ends, clients go bankrupt or refuse to pay and you have to take them to court.
Even when you're working, you're not actually being creative, in any sort of meaningful sense; you're working for a client, usually based on an existing property, with an entire team of people who all get creative input (so called 'design by committee').
Want to be an auteur with total creative control? Well, okay, then you better also learn to be a great entrepreneur, business manager, accountant, producer, and salesman as well because unless you control the money, and know where to find it, you're never going to be able to call the shots.
There are a surprising number of professional artists with wealthy spouses or parents...
Making a living as an artist isn't an impossible dream, provided you actually know what that entails.