Ref: The Pragmatic Programmer
Entropy is a term from physics that refers to the amount of disorder in a system. When disorder increases in software, programmers call it "software rot".
Consider a building with a few broken windows. If the windows are not
repaired, the tendency is for vandals to break a few more windows.
Eventually, they may even break into the building, and if it's
unoccupied, perhaps become squatters or light fires inside.
TIP 4: Don't Live with Broken Windows