That's a fair question! Do you know? If you don't know, then you need to ponder because this is very important to how you market "your stuff."
Here is a quick rundown on what this is and why it is important.
In marketing speak, it is called your core competency.
What do you do better than your competitor?
What sets your business apart from the others?
How is your product going to stand out in the crowd?
Why would anybody want to buy your stuff?
It doesn't matter if you have a hobby business or a full time business, if you are selling onine, you ARE in business!
Once you figure out what sets you apart, you can utilze that information in many ways:
Create a tag line or motto or mission statement from it.
Use that everywhere by attaching it to your logo or identity.
Put it on your invoices.
Sign off your emails and snail mails with it.
Pepper the internet with it in your profiles everywhere
Be prepared with a 25 word answer when people ask "and, what do YOU do??
Some ideas to target in your pondering:
Is your design unique?
Is your product innovative?
Is your product unusual?
Are your materials different?
Is your customer service a signature service to you?
Is your shipping fast, cheap, accurate?
Do you always send a gift or sample?
What is unique to YOU?
You get the picture...
This little answer can actually define who you are as a business person and as an artist/crafter and will shape your marketing efforts. Eventually, after marketing this competency to the world, people will recognize your business in this way!