Hi,
Aggregates are nothing but a collection of most used data. You can have a cube with 10 characteristics and KFs and have 5 aggregates on it that has most used data sets so that system can read them easily while running a report.
Updating the aggregates is called Rolling up of aggreagtes.
Refer to the link below.
[BW agrgegates|http://help.sap.com/saphelp_bw30b/helpdata/en/7d/eb683cc5e8ca68e10000000a114084/frameset.htm]
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