When traveling to different countries, outlet types and voltages can vary. Here are some examples of countries where you might need a travel adapter:

1. United Kingdom: In the United Kingdom, unique G-type outlets are used, with three rectangular pins. You need a travel adapter to connect your electronic devices to British outlets.

2. United States and Canada: In the United States and Canada, A-type outlets are used, with two flat pins. A travel adapter is required to safely connect your devices to these outlets.

3. Australia and New Zealand: In these countries, I-type outlets are used, with three slanted pins in a triangular shape. You need a travel adapter to connect your devices to these outlets.

4. Switzerland: Switzerland uses J-type outlets, with three round pins in an equilateral triangular configuration. A travel adapter is needed to connect your electronic devices to Swiss outlets.

These are just a few examples, and there are many more countries where specific travel adapters might be necessary. It is always advisable to check the outlet types and requirements of your destination before traveling, so you can bring the right travel adapters to use your devices safely.