A sandwich is a popular food item as the most practical package lunch for taking to work, school or picnics.
You can use many types of bread for making your sandwich and the filling can be varied and adaptable.The modern sandwiches are prepared with breads coated with condiments and contain a combination of salad vegetables, meat, cheese, and a variety of sauces or savoury spreads.
There is a list of 64 regional sandwich styles in the wikipedia article on sandwich:
Tips for making healthy delicious sandwiches
1- Choose good whole grain sandwich bread, or Pita and 'Lavash' flat bread.
2- Choose low fat cheese.
3- Try vegetable based high fiber spreads.
4- Prepare grated walnut, cheese and chopped fresh herbs in small quantities ahead, and keep refrigerated or use readily.
5- Try chopped fresh herbs and roasted vegetables.
7- Cut your sandwich in smaller portions before wrapping, and keep in cold place.