Indexing means simply explain pls?

Hi,
indexing means simply explain pls?

Index :
An Index is a copy of database table having few numbers of fields. This copy is always in sorted form. As we know, Sorted data would always have a speed access from a database table. Hence, we use an index for the table while reading the database records. Index also contains a pointer pointing towards actual database table so that it can access fields that are not contained in the Index
For More Information About Index :
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/profile/2007/09/19/indexinginSAP+Tables
Regards.

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