Stores are great for regular sellers, sellers with many items for sale, and businesses. Potential buyers can easily access all of your auctions through your store, as well as get a little information about you. You can even upload your logo to appear on your store page. Your store will also appear in the "Stores" part of the site, accessible through the tab at the top of any page.
If you're an occasional seller, an "About Me" page might work better for you. On these pages you can include some text about yourself, what you're looking for, etc.