What type of pasta is commonly used in lasagna?

The type of pasta commonly used in lasagna is flat lasagna sheets. These sheets are specifically designed for layering within the dish, making them ideal for creating the structure of lasagna. Unlike other pasta shapes, flat lasagna sheets allow for even layering of pasta, sauce, cheese, and fillings, ensuring that each bite contains all the elements of the dish.

Using flat sheets helps in maintaining the right texture and ensures that the lasagna holds its shape when served. Other pasta shapes like spaghetti, fusilli, and penne do not provide the same layering capability and would not create the traditional baked lasagna experience, making them unsuitable for this particular dish.