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SANTY AKULASANTY AKULA 

what is global search?

Khan AnasKhan Anas (Salesforce Developers) 
Hi Santy,

I trust you are doing very well.

The Global Search helps you search all standard and custom objects, Articles, Documents, Products, Solutions, Chatter, Chatter feeds, Files, Groups, Topics, People, etc.

Global Search gives you results by keeping the record of which objects you use, how frequently you use them and arranges the search results based on that information. This means that the records you most frequently search on and view are shown at the top of the list.

Please refer to the below links which might help you further.

https://cloud4good.com/announcements/best-practices-for-using-salesforce-global-search/

http://www.dhruvsoft.com/blog/salesforce-tip-of-the-day-using-global-search/

http://www.stimulusconsulting.co.uk/blog/salesforce-global-search/


I hope it helps you.

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in future.

Thanks and Regards,
Khan Anas
Kt YadavKt Yadav
Hi Santy,
Global search is available in Lightning Experience only.It will start suggesting you the results once you type in this search box.If you press enter it will show you the matching results present in you org.In the left hand side you will see the top results section contains frequent searced object inside your org and in the right side you will get the matching results from the different objects.
User-added image

Please refer this Salesforce link for more details: 
https://releasenotes.docs.salesforce.com/en-us/winter17/release-notes/rn_lex_setup_lightning_search_204.htm