packet 3 question

[hello2000]

packet 3 question 21: LIST DATES OF ALL PREVIOUS VIITS TO OR RESIDENCE IN THE UNITED STATES.

VISA TYPE OR "A" NO.(if known)

What is the difference between VISA and TYPE? What should be filled?

Help is appreciated.

[Mogambo]

VISA and TYPE are to be read together. Basically it wants to list your trips to USA and your status(like F1, H1 etc)