Explain what is the difference between OLAP tools and ETL tools ?

The difference between ETL and OLAP tool is that

ETL tool is meant for the extraction of data from the legacy systems and load into specified data base with some process of cleansing data.

Example: Data stage, Informatica etc.

 

While OLAP is meant for reporting purposes on OLAP data available in the multidirectional model.

Example: Business Objects, Cognos etc.