Survival depends on purchase

I have been engaged in this technical development and do not pay much attention to sales,
However, I recently heard a saying that survival depends on sales and purchase only for special money.
Because it is computer technology software development, if it can be considered procurement, or the hardware sold by the company is procurement.
Haha, I just want to know the importance of sales.
I used to think that as long as I made a unique software, I was afraid that no one would buy it.
It is found that there are too many strong people in the world.
In the past, I always thought that the company's sales were so happy that they could go out every day and eat with customers. Most of the consumption could be reimbursed.

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A comfortable life. I recently read "circle trap" to understand the sales circle.
It can be said that it is also a technical capability, what technical capability, or a fraudulent technical capability.
No, because it is the technical capability of planning and the global variable...

It may also be a coincidence that two companies are very close to sales.
I heard about them and their customers every day, and now I understand that they let the company survive.

Now the company has quit. How can we take the products we bring from the company to the path of sales.

It seems that we have to think about how the sales guys did it.