Changing from one thing to another; turning something on or off using a switch.
From Middle Dutch 'swijch' (thin stick or rod), which referred to a rod used to control horses or administer punishment. Over time, 'switch' came to mean any tool used to change or divert something, including electrical switches.
Your brain does incredible 'switching' between tasks, but neuroscientists found that human task-switching is actually slower and less efficient than computers—we can only truly focus on one complex thing at a time, which is why multitasking is mostly a myth.
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