Much of Amazon’s sunny Thursday earnings report for the third quarter of 2015 can be traced back to its Web Services cloud division.

AWS brought in $2.09 billion in sales in the quarter ended Sept. 30, representing a jump of 78 percent over the same period last year. With an operating profit of $521 million — up from just $98 million a year earlier — the unit’s operating profit margin was 25 percent for the quarter, up from 21 percent in Q2 and 17 percent in Q1.

Overall, Amazon beat analyst expectations with $25.4 billion in net sales and a profit of $79 million, or 17 cents cents per share. Analysts polled by Thomson Reuters were expecting a loss of 13 cents per share on sales of $24.91 billion.

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