Muni is the public transit system for the city. Students can get MUNI passes for transportation throughout the city.
Bart is the Bay Area's rapid transit system with five routes connecting the city with other cities in the East Bay
Caltrain is another option for travel in the direction of Silicon Valley.
Check out further transportation information at:
MUNI: http://www.sfmta.com/
BART: http://www.bart.gov/
Caltrain: http://www.caltrain.com/stations/sanfranciscostation.html