The most popular street food can vary greatly depending on the culinary preferences and local traditions of each region and country. However, there are some street food specialties that are loved all over the world, such as:

1. Hamburger: the classic hamburger is one of the most loved street foods in the world. The combination of bread, ground meat and seasonings makes it a simple but delicious food.
2. Tacos: Tacos are a Mexican specialty that is gaining more and more popularity around the world. It is a tortilla filled with meat, vegetables and sauces.
3. Hot dog: The hot dog is another classic street food that is very popular, especially in the United States. It consists of a sausage, often made of pork or beef, served in a bun.
4. Kebab: kebab is a Turkish specialty, but very widespread throughout the world. This is meat roasted on a vertical skewer, often served in a sandwich with vegetables and sauces.
5. Fish and chips: fish and chips is a traditional English dish, which consists of fried fish served with chips.
6. Ramen: Ramen is a Japanese specialty, consisting of a soup of noodles, meat or fish, and a variety of vegetables and condiments.

In summary, there are many street foods loved around the world, and the choice mainly depends on individual preferences.