An internship is a great way for college students and others to gain experience in a given field. Interns may be paid or unpaid, or they may receive a stipend instead of wages or salary. But there's one thing that an internship is not, and that's permanent.
Companies generally hire interns to work for a set period of time. Sometimes it's for the duration of a specific project, other times it's for a set number of weeks or months. Essentially, the internship ends when the company says it ends.