100 data records is, basically, 100 items. Probably, the most common case you'll have on elastic.io Connect at the moment is moving your invoices around. So, 100 data records will be 100 invoices. But it can also be 100 invoice due dates or 100 customers' contact data (the latter will be exported as a bundle, meaning that 1 data record will include the customer's first and last names, his/her email address and any additional information assigned to this particular customer). Note, though, that each time you move an item from one system into another and also each update of this item will be considered as a new data records, even if it's one and the same item.