If you met two individuals and one was scrambling to find a pen and something to write on and the other person simply pulled out a business card, who would you want to do business with? Showing that you are prepared at all times is a great indicator that you are professional.
Most business cards are paper, although there are lots of other options, from plastic and wood to metal and slate. Assuming you go with paper, you need to choose thickness, coating, color and weight. All of these can affect the price.
Your business card template is designed with a professional layout. An experienced designer has taken this tiny 2 inch by 3.5 inch printable canvas and transformed it into a lead magnet. Every contact detail will be on it is own line, in some cases with icons next to them, or inside boxes. All the design elements will be setup on a grid. This allows someone looking at your business card to see the design as well-organized and find important information quickly. Below are some example of a business card grid.
Two individuals with their heads buried in their phones typing away woould not create any kind of significant memory of the encounter. You can easily transfer the information from a business card to your mobile device after the conversation.