The server returns one page of records at a time. Each page will contain pageSize records, which is 100 by default.
If there are more records, the response will contain an offset. To fetch the next page of records, include offset in the next request's parameters.
Pagination will stop when you've reached the end of your table. If the maxRecords parameter is passed, pagination will stop once you've reached this maximum.
Extract from the Airtable documentation :