A travel charger is also known as a converter. Typically a travel charger or converter converts, that is steps down, the local electricity to a lower voltage. The US and Canada use lower voltage electricity than most parts of the world.
Match the prongs of the power plug for the device or converter to the slots on the adapter and then insert the plug adapter into the wall outlet. Prevent a power surge or sparks by checking that the cord and adapter fit tightly together before plugging it into a working power supply.