The mask tool in design software is a vital feature that allows designers to control the visibility of specific parts of an image or design element without permanently changing the underlying content. It is commonly utilized in photo editing, graphic design, and digital illustration. 

Wholesale rack cards are an effective marketing tool that can help businesses showcase their products and services with visual appeal. Typically measuring 4”x9”, these cards are designed for display in brochure racks, making them easily accessible to potential customers.