Elementary search helps, Collective search help.

elementary search help is for f4 help and collectice search help is the collection of elementary search helps

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Elementary search helps defines a search path where we will define the table from which the data has to be read and the selection criteria. Through import and export parameters. Used when we gets the data rom a single table. 
 
Collective search helps:- Combination of elementary search helps. When we need to fetch data based on multiple selection criterias. More than one tables are  
Selection from multiple tables

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Elementry search help describes a search path it display all the possible input values for a seach field.
Collection of elementry searchhelp is known as collective search help. The user can thus choose one of the several alternative path with a collective search help.