What a label template is
A label template is two things at once: the words and artwork on one label, and the sheet of positions that label is printed on. A US Letter sheet of 30 address labels is not one big page. It is a grid of 3 columns and 10 rows, and each position has its own size, margin and gap.
This directory lists every label template the free label maker supports. Each card opens the tool on that sheet, so the grid, the label size and the print settings are already in place. Nothing is a stock photo: the small sheet on the card is drawn from the same numbers the printer uses.