Occasionally it's nice to give them something tangible
When I began my design career everything was about print collateral.
These days, most of the ideas a company needs to express can be done digitally. Still, print materials are a very important part of branding and marketing. After all, sometimes it's nice to have something you can hold in your hands. Yeah, you can text someone your number or email them your web address, but handing someone a business card with your brand identity can have a bigger impact.