a reship is a company that for payment they will ship you items that you cannot get shipped to you, like say if X company doesn't ship the the UK then you make a reship account, get it send to the address of the reship company then you pay the reship company and they ship it to you.
for refunds reships usally don't work, they know the address of most big reships and wont refund on it if you try. and most reships also verify the package came so you cant do DNA witch is one of the most popular refund methods.
a reship is good to use for SE's so you don't get rebilled and then you can SE places that you wouldn't be able to because of where you live since you can SE companys that dont ship to where you live using a reship.
also try not to use click bait titles and put a more detail. like reship questions or something like that.