An index is the same as one of the names of the database used by the search engine.
Indexing helps to collect and store all kind of data to facilitate fast and accurate information to multiple users at multiple requests.
Purpose
Indexing service and regular maintenance required to optimize speed to provide high-level performance for better finding a query. And without any service, it required and consume more time and power.
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Indexing service is a kind of service which is assigned to any description and documents to extract meaningful information.
This meaningful extracted information is used to construct the various indexed catalogue to provide various efficient and rapid searching services.
Indexing services includes various design support, maintenance and various calculation and distribution of indexes.
Indexing services include various kinds of popular servicing which include keyword indexing, niche indexing, any semantic or conceptual indexing, category wise subject indexing as well image indexing to avoid copyright rules.
Index Calculation
Index calculation involves the calculation of various index values and the index number.
An index value is a ratio if nominal value to its relative value which is calculated in a particular base year. Whereas, the index number is equal to the sum of relative value prices divided by the number of items.
The main problem during the index calculation arises in the construction of index number which depends on various factors in which some main points to take care includes the selection of base year, selecting commodities, collection of prices, selecting and finding averages, weights.
After keeping these points it can be easily calculated by dividing the current year by the previous year to find the index.
Index Development
Index development is a kind of development tool used to measure overall achievement including social and economic factors.
The social and economic dimensions depend on factors includes health, literacy rate and the GDP and the standard of living.
Source: http://indexcalculations.aircus.com/now-store-and-facilitate-all-kinds-of-data-accurately