Travel adapters are used when traveling to countries with different standard of contact sockets. The adapter provides a transition between the two standards, so you can use your electrical appliances in the country or vice versa - use electrical appliances purchased in a country with a different standard in our power grid. Travel adapters are a cost-effective and optimal way to combine your electrical appliances with power grid without having to buy new electrical appliances just because of the difference in standards.
The travel adapter is not a transformer or a frequency converter. So please, check carefully before using the adapter.