What is the different between ecomdash ID and ecomdash item ID?

Within ecomdash, there are two different attribute fields used during the process of exporting and importing sales orders to/from a dropshipper: 

1. Ecomdash ID: This ID is given to a entire order. 

2. Ecomdash Item ID: This ID is given at the line item level. This is mainly used when you have different tracking IDs for each line item.