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An operating expense (also operational expenditure, OPEX) is an expense required for the day-to-day functioning of a business.
A capital expense (also capital expenditure, CAPEX) is an expense a business incurs to create a benefit in the future.
https://www.accountingcoach.com/blog/capital-expenditure-revenue-expenditure
http://www.business-literacy.com/financial-concepts/expensing-capitalizing/
https://corporatefinanceinstitute.com/resources/knowledge/accounting/capital-expenditures/