Answer straight to the point.
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Opex (operating expenditure) is an ongoing cost for running a product, business, or system.
 
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Examples: the cost of employees and service expenses such as rent and water, gas, electricity. 
 
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Capex (capital expenditure) is the cost of developing or providing non-consumable parts for the product or system. 
 
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Examples: Building, machines, Patents, Serverr.
 
Hope this helps! 
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