Round wire nails are used for rough carpentry where strength is more important than appearance as they can split wood. Oval wire nails and round or lost head nails are more suitable for joinery work where appearance matters as they can be driven below the wood surface and are less likely to split wood. Different types of nails are used for various purposes like tacks for fixing carpets, panel pins for cabinet making, cut floor brads for floorboards, and masonry nails for attaching wood to brickwork. Nails come in a variety of sizes and styles to suit different materials and applications.