I'll description about Tom yum kung.
If you ask any foreigners who have ever visited Thailand about their favourite Thai food, their answers, almost without exception, will be tom yam kung.
Tom yam kung, or spicy shrimp soup, is the number one of the top ten Thai dishes loved by foreigners. And I think it is one of the most favourite dishes for Thai people as well. It is simply because it is so delicious for its unique sour and spicy taste. Tom yum kung is widely served in neighbouring countries such as Cambodia, Brunei, Malaysia and Singapore, and has been popularised around the world.