what do you call something that was created to solve a problem [closed]

Question

what do you call something that was created to solve a problem?

Let's use the operating system as an example:

1. Before the operating system was invented, developers needed to implement really basic programs for each application, like getting user key input and displaying corresponding texts on the screen, resulting in high cost of developing software...

2. The operating system was invented in order to solve this problem.

3. Its solution to the problem was to provide programs that had basic functionalities that every application needs.

So, you can say, the essence of OS is "a set of programs that have basic functionalities that every application needed".

QUESTION In this example, solution is "to create and provide a set of programs that have basic functionalities that every application needs, which is, the operating system". I don't want "to create and provide" part. I just want a word that just means the operating system in this context. Not a solution coz it includes verbs too. I am feeling like this needs to be explanatory, like "a thing that was created to solve a problem". I don't even know how it's called in my mother tongue actually.

Answer 1

Well the obvious answer to your question and to any problem is its solution.

... each application developer needed to implement really basic programs, like getting user key input and displaying corresponding texts on the screen, resulting in high cost of developing software...

The solution/remedy/answer to this problem was the operating system.

Less formally

The fix for this problem was the operating system.

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If you want a short way of saying

"a set of programs that have basic functionalities that every application needs"

Then clearly the answer is operating system.

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If this is not what you want then please explain where it falls short. Thank you.

P.S. The question in the title of your post is not the same as the question at the end. This is confusing.