A jelly roll pan is a type of baking sheet, but it has higher sides than a typical baking sheet. Jelly roll pans are usually 15x10 inches and have raised edges that are 1 inch tall. These sides make jelly roll pans ideal for baking jelly rolls, bar cookies, and other items that require higher edges than a typical baking sheet.   On the other hand, baking sheets are typically flat and rectangular with no raised edges. They are great for roasting vegetables or baking cookies that don't require high sides (cookie sheet pan). However, half-baking sheet pans are typically 18 x 13 with a 1-inch edge, and that works just as well with baking as a jelly roll pan. So, jelly roll pans and baking sheets are different, but both can be used to create delicious treats!