Getting experience is one of the best ways to learn whether or not a career field is right for you. It can give you the opportunity to "gain insight" into a particular career field. There are a variety of experiential opportunities out there that will help you gain experience, from short-term volunteer work to a semester or summer-long internship.
Experience is highly valued by a potential employer. Employers are able to see how you have developed and applied career specific and general skills. Interests and skills are great indicators of your ability to contribute to and succeed in their organization. In addition, full-time job opportunities may develop out of these experiences. After observing the quality of your work, employers can hire you with confidence.