Different printers use different types of ink cartridges. To figure out which kind your printer uses, you can look at the ink cartridges that should already be in it.
Open the lid and carefully take a cartridge out. There should be a large number on the outside of the cartridge. That number is the ink cartridge number that identifies what kind it is. Use this number to select the correct kind when you are purchasing new ink.
If you do not have ink already in your printer or do not have a number on your cartridge, you can travel to the printer manufacturer's respective website. From there, search for your printer by entering in your printer model number into the search box. This should lead you to information to find out more about your printer and the ink it uses.
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