It literally means "salad rolls" and should be distinguished from the fried rolls. The translucent cigar-shaped rolls are packed with greens, sometimes shrimp and/or pork, and herbs. They need a dunk in nước chấm of course. Almost every region in Vietnam has its own distinct spring roll but no matter where you are, the wrapping and rolling process is more or less the same.
Phở cuốn is a Hanoi delicacy. It’s made by wrapping fried beef with onion, lettuce, coriandrum sativum, basil and other vegetables in a think wrap of the same rice noodle material used to make phở noodles. It’s served with a small bowl of dipping sauce.