What coffee does Starbucks use?

Can you tell me more about the coffee that Starbucks serves in their stores? I'm curious about the specific beans they use, their origins, and any unique blending processes that might be involved. Do they source their coffee from sustainable farms, and do they have any partnerships with coffee farmers around the world? Also, do they offer any coffee options that cater to specific tastes or dietary restrictions, like decaf or vegan-friendly options?