Many people go to college for one degree, work for a few years, then go back to college to get a higher degree or specialized certification in their field, or get a degree in a new field so they can change careers.
Types of College Degrees

Colleges and universities offer a wide-range of undergraduate and graduate degrees.
Q&A: Master’s Degree But No Job Offers
"I’m shocked and ANGRY that my past work experience and master’s degree don’t matter to employers ..."