There are several types of travel adapters available to connect electronic devices in different countries. Here are some common travel adapters:

1. Type A: This plug, also known as the American plug, has two flat pins and is used in countries such as the United States, Canada, Mexico, Japan, and various other countries in North and South America.

2. Type B: This is a variant of the Type A plug, with two flat pins and a round grounding pin. This plug is also used in the United States, Canada, Mexico, and other countries in North and South America.

3. Type C: The Type C plug, also known as the European plug, has two round pins and is used in most European countries, as well as in countries in Africa, Asia, and other parts of the world.

4. Type D: This plug has three large round pins in a triangular formation and is commonly used in India and a few other countries in Asia and Africa.

5. Type E: This is a variant of the Type C plug, with two round pins and a grounding clip on the side. This plug is mainly used in France, Belgium, Poland, Slovakia, and some other countries.

6. Type F: The Type F plug, also known as the Schuko plug, has two round pins and two metal grounding clips on the sides. This plug is widely used in Germany, Austria, the Netherlands, Spain, Portugal, and various other countries in Europe.

7. Type G: This plug has three rectangular pins in a triangular formation and is used in the United Kingdom, Ireland, Malta, Malaysia, and a few other countries.

These are just a few examples of travel adapters, but there are other types available. It is important to check which type of plug is used in the specific country before connecting electronic devices.