Some people confuse job shadowing with internships. But, these two have different aspects. With job shadowing, learners observe how employers in particular roles carry out their duties. They do not put their hands on the tasks but instead follow their mentors around like a shadow.
It is up to a learner to ensure they maximize their learning time with their trainer. They ask as many questions as they would like answered and only take a few days or weeks to shadow. A company may give them a similar task with their personal working space after learning and seeing how they perform. Once they are done, they can add this shadowing experience to resumes to increase their marketability.