How restarting the computer solves 80% of the problems

Whenever we face some issues in our windows desktop or laptop, the first thing we get in suggestion is  to restart the device. Restart or reboot works in a very magical way when our laptop is lagging around but how does it really work?

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Majority of uses window in our day to day life. We perform various installations, operations and other tasks on it. During all of these window face many errors and problems and it tries to fix most of them on it's own, but due to deadlocks or low end components it failed sometimes, in that case restarting it solves the problem.

Example if we're using a heavy software(ex. photoshop or android studio) and at the same time we're using chrome browser with multiple tabs opened, we might get a serious lag or hang around condition in our system. Or, if we're installing games that contains the size of 50gb or more we might face the same issue during the installation. Even after closing the tabs or chrome or the installation of the game the issue can stay, this is because some background thread processes may remain ongoing. 

Sometimes window stuck in a loop, suppose we installs a software that needs a resource named "A", but the resource was not in his position it's in the position of "B", so window will go to B's position to find A, but again if he found that A is not there he is on his own position, here window will go to A's position then B's position and the cycle will repeat again and again, in this way window will stuck in a never breaking loop and our system may slow down. 

What restarting do is, it kills all the programs, processes and threads that are running in background or in foreground. It even kills windows internal processes, which includes registries, memory allocation, drivers and software updates. Then it restarts the windows and in this process if a part of the window is missing or corrupted it tries to fix by searching where the window is installed in our local disk. After the fixes getting applied our system reloads for a smooth operating.