No, not all appliances need to be earthed. However, any appliance that uses electricity should be properly earthed in order to protect against electrical shocks.
Appliances that use electricity have an electrical current running through them. This current can be dangerous if it comes into contact with your body. To protect against this, appliances need to be properly earthed.
Earthed appliances have a wire that is connected to the earth. This wire helps to dissipate any electrical current that may come into contact with your body. This protects you from electrical shocks.
Not all appliances need to be earthed. However, any appliance that uses electricity should be properly earthed in order to protect against electrical shocks.