Business card Why or Why not to have it.

I asked my Aunt in a email about her business card for her business. My first question was that why do you have it in the first place?She replied with "It is a great way to get the word out on your business" "It helps and is a way to advertise as well as attract costumers" She also said that it is more convenient than sending out fliers. She said that business cards helped improve her company greatly.