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Limit
The limit is the number of records returned per page. By default the limit is set to 100 records. You can see this at the bottom of your results when you make a call. You can change this by including &limit=X as part of your call to the API
Offset
The offset is the page of the results you are viewing. By default, the offset is set to 0. The default of 0 actually means you are on page 1 (meaning there is no offset). You can change this by using &offset=1 to move to the 2nd page, and so on.