You could search anything from job availability to salary information to actual companies and careers. This is also an excellent way to build some networking contacts. If someone you know is already involved in your career of interest, contact him or her for more information. Before you make a final decision regarding a major, it would be advantageous to see these careers up close and in person. Terms used to describe the time spent exploring more about an actual career are interning and job shadowing.
Internships usually take place during the summer but can also take place over the semester.
They take place in a job related to your major and sometimes are used for college credit. Also, sometimes they are not paid positions. Job shadowing is a shorter process. It can be for as long a period of time as you and an employer decide. For example, if you think you might really want to be a park ranger, you could contact a park ranger and observe them for a day.