Every piece of software begins as a small application and grows with time. New features and functions are added. Some old functions are deprecated or removed. It's a live product, which evolves with time. The process is pretty similar to how a building is built. It's small at first with only the base. Afterwards, windows, doors, and bricks are added. Then, the roof is constructed. Later, the internal parts are finished. The whole process takes a lot of time if everything is designed from scratch. There is no need to reinvent the wheel every time and to build windows or doors from scratch. We can go and buy standardized working components, which can be easily installed in the right place in a building. This saves resources and significantly reduces the time for execution of the whole project. Later on, it's even easier to replace...
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