A “card slot” refers to a cutout for credit cards and/or business cards. This feature is almost a necessity in the business environment for those using the tablet in office. Regardless of case style, the card slot will typically be on the inside front cover. It should be among the most accessible of all pockets for easy insertion/removal of cards.
Card slots are common with portfolio and folio cases in leather, faux-leather, and synthetic materials. Tablet sleeves can have them too. Some card slots are simple cutouts, others feature a pocket-style slot.