What Kind Of File Works Best

When a client wants to send their logo or image for embroidering on products, we're always asked what format we need it in . . . 

'jdgeijajdnbfyrenbc

;guyerashvbhvhvvvvvvvvvvvvvvjbbbbbbbbbbbbbbbbb

bbbbbbbbbbbbbbbbbbbbbbbbbttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttgggggggggggggggsssssssssssssssssa