When creating or editing fields, you are given the checkbox option to "Exclude from display".
This option essentially lets you create the field, store value in it, but not show it to visitors in your store. This can be found when creating or editing a field, under the Additional Settings menu.
This setting can be useful if the field you are creating will be printed already with other liquid code if you're customizing the output.
There's an example of this in action in our guide on Displaying Product Data in a Table.