Coffee capsules are the plastic containers with an aluminum foil seal, with ground coffee contained inside. The capsule is either part of an open or closed system; open systems allow for a broader range of product to be use in the machine, because there are many manufacturers whose capsules are compatible with that machine.
Closed-system capsules include the likes of Nespresso coffee capsules, which simply means you can only use one brand of compatible capsule sin your machine. A coffee capsule is what we know moist widely, and is used for an array of products, not just ground coffee.

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