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A covered call is a process in which one owns shares of a stock or other securities, and then sells (or "writes") a corresponding amount of call options. Payoffs on the stock are always the same, as with a short put option, hence the price (or premium ) should always remain the same, as with a short put or naked put.
Writing a covered call generates income, in the form of a premium; however, the risk of stock ownership is not eliminated. Therefore, potential loss is equivalent to subtraction of the total amount paid as premium. Also there is potential upside down through this strategy.