Digitally printed transfers machines print logo onto a vinyl or PVC that can be then applied onto your garment using heat. A little like an iron-on transfer. Heat pressed transfers are ideal for nylons and polyester rich fabrics which can case registration and bleeding issue if attempting to print using screen printing.
Screen printed transfers give a very high quality finish and a very nice thin print. With this process you print the image on to paper using a screen, and then you heat apply it to the garment. All the colours go on at once, so you have none of the registration issues you normally have when direct printing difficult garments.