A long, long time ago, the person responsible for providing requirements to programmers was called the boss, or the customer.
The boss is often dissatisfied with what the programmer has made, and wants to do it several times, but when his mind flashes "delete the library and run away", he can't help but let go of his clenched fist.
Programmers are also often dissatisfied with the demands of their bosses, and want to do it several times, but when the brain flashes "get off the hook", they can't help but drop their clenched fists.
The results of products produced in this embarrassment can be imagined.
Time passed for a long time, and a very smart boss came up with an idea: hire someone and arrange a position called "product manager".
He told the product manager that you will be responsible for sorting out my needs in the future, and then conveying them to the programmer. If anyone dares to beat you, come to me and I will vent your anger.
Then he told the programmer that in the future he will be responsible for raising your requirements and calling the product manager. If he dares to beat you, you will find me and I will vent your anger.
So, the boss drank tea every day and watched with a smile as the product manager and the programmer forced a fight. No need to worry about being beaten, and no need to worry about programmers deleting libraries and running away.
Thus, the product manager came into being!
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