There are several reasons why it is wise to unplug a device from the socket when it is not in use. Here are some important reasons:

1. Safety: Unplugging from the socket reduces the risk of electric shock and short circuits. If the plug remains in the socket, there is a small chance of accidental contact with the live pins, especially if children or pets are around.

2. Energy saving: Even when a device is turned off, it can still consume a small amount of standby power, also known as phantom load. By unplugging, you prevent unnecessary energy consumption and save on your energy bill.

3. Fire safety: Although rare, electrical issues can occur, such as short circuits or overheating, even when a device is off. By unplugging, you minimize the risk of fire due to electrical failures.

4. Protection against power surges: In the event of a power surge in the electrical network, for example due to lightning or power outages, it may be wise to unplug sensitive electronic devices. This can help prevent damage to the equipment resulting from a sudden increase in voltage.

5. Maintenance and lifespan of devices: By unplugging, you avoid potential damage to the plug or cord, such as bending, breaking, or kinking. This helps extend the lifespan of the devices and reduces the chance of failures.

Unplugging when a device is not in use is therefore a good habit to ensure safety, save energy, and extend the life of devices.