What is the purpose of voltage regulators?

Voltage regulators are intended to keep a certain voltage level, which is important for most electronics to run properly. Without a voltage regulator, if an electronic, such as a computer, receives too much voltage then it can fry the components.
Controls output of alternator so battery does not over or undercharge Should control voltage range from (when engine running) 13.8-14.2 volts Without voltage regulator: Voltage could go to 18-24 volts causing electrical components to burn out