title_body: What Type of Coffee Is Used In a Coffee-Maker?
upvoted_answer: Ground coffee is just the roasted coffee beans ground up to a fine powder. In order to make the beverage coffee, you need to combine this with hot water to extract the flavour (there are many different ways to do this). Typically, there is a filter that makes sure that the water can pass through the ground coffee but none of the ground ends up in your drink. 
  
  Instant coffee is dried brewed coffee - they grind up the coffee beans, brew the coffee and then remove the water.
  
  A coffee machine or coffee maker is used for brewing coffee from ground coffee, not instant coffee. Instant coffee powder just needs to be rehydrated, so adding hot water is enough. It will completely dissolve in the water, which the ground in a coffee maker will not.
  
  The machine you bought seems to be an espresso machine (it puts the water with high pressure through the ground coffee). This requires a relatively fine ground. Preground espresso will probably work, or you can also buy a grinder and grind the beans yourself. It also seems to have a pressurized filter basket, which means it will be quite forgiving and therefore easy to use.