How do sandwiches vary?

Sandwiches vary widely in ingredients, types of bread, and preparation methods across cultures. They can be hot or cold, featuring fillings like meats, cheeses, vegetables, and spreads, with regional specialties such as the Vietnamese bánh mì or the Italian panini. Additionally, the way sandwiches are assembled—open-faced, stacked, or wrapped—contributes to their diversity. This flexibility allows for creativity and adaptation to different tastes and dietary preferences.