Embossing is a letterpress process where we impress an image into card or paper, usually upwards on the front. Braille is often embossed into cards. The image might be a floral arrangement on a wedding invite, a company logo on business cards or letterheads, or a security seal on a function ticket or whatever you can imagine. We call it blind embossing.
Some people call foiled printing embossing, but we don’t.