How do travel adapters work?
 
Travel adapters are simple devices that enable a user to plug any electronic device into walls with different sockets determined by a region of the world. On the one end adapter has prongs that fit the wall socket and at the other ends is a socket itself for a user device cable.

People confuse Travel Adapters and Travel Converters but it is important to remember that these are NOT the same thing. Converters are more complicated devices that convert a voltage. Adapters do not do it.
 
Is this travel adapter grounded or non-grounded?
 
Yes, this travel adapter is grounded which means it is suitable for use with a three-prong type of electrical sockets. All devices will work normally without the ground wire because it's not a part of conducting path, however, grounding guarantees an extra security and protection for your appliances.