Studying abroad typically gives your resume a nice boost and improves your post-graduate employment, particularly if you're considering a career in business, international affairs, or government service.
The same international skills that make you more marketable for employment are also valued by graduate schools.
These skills include cross-cultural communication skills, analytical skills, teamwork, flexibility, an understanding of cultural contexts, the ability to adapt to new circumstances and deal with differences, a developed view of the world outside the U.S., independence, and self-confidence.