Hotline refers to a subset of a list that is based on how recently they were added to the file.  In general, hotlines tend to be 1 month, 2 month, 3 month, 6 month or 12 month new adds.  By renting only a 60 day new to file segment, you should see a lift in response as compared to renting a 12 month or 24 month segment of the file. Depending upon the file there may be an upcharge for selecting recency.