What is OLAP and write its type?

1.	What is OLAP and write its type?
Answer» The Online Analytical Processing (OLAP) method is used to PERFORM multidimensional analyses on large volumes of data from multiple database systems simultaneously. Apart from managing large amounts of historical data, it provides aggregation and summation capabilities (computing and presenting data in a summarized form for STATISTICAL analysis), as well as STORING INFORMATION at different levels of granularity to assist in decision-making. Among its types are DOLAP (Desktop OLAP), ROLAP (Relation OLAP), MOLAP (Multi OLAP), and HOLAP (Hybrid OLAP).

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