When invoked on a Paginate object, it sets the current page of the pagination.
By default, the current page attribute of a Paginate object is inferred from the URL parameter given by page_param (which defaults to "page"). If the URL parameter is not present, page defaults to 1 (first page of results).
{% assign countries = website.countries | page: 1 %}
{% assign orders = user.orders | page: request.params['order-page'] %}