Plagiarism is a type of "mistake" that ranks very highly on the unethical scale though.
You might have heard a bit of it from when you studied, maybe got a stern warning over an assignment using sources, but the further you go professionally, the more dangerous it becomes to plagiarise.
At university, it can get you banned from entering ever again. Universities also keep a public listing of those, making you unable to enter any other institution as well. At the very least, you won't be welcome to retry the course.
https://www.scanmyessay.com/plagiarism/consequences-of-plagiarism.php
At other jobs, you can get in legal trouble (copyright, monetary compensation, prison), depending on what you plagiarise and from who. In software, it will likely get you fired too. In journalism, where your job is research and compilation of sources, that would be a sign of incompetence.
Edit:
In creative domains, I've often seen employers removing every single trace of the plagiator (even creations that probably weren't plagiarised) as a measure of security, on top of firing them.
Maybe a lot of people in this thread come from higher academics, and thus take plagiarism very seriously - as a career ender - due to professional deformation. We got it drilled in our brains: never plagiarise.