What is the difference between the drop and create the index and rebuild index ?

Hi All,
what is the difference between drop and create index & rebuild index ? i think both are same...Please clarify if both are same or any difference...
Thanks in Advance,
rup

Both are same. Rebuilding an index drops and re-creates the index. 
Ref:
SSMS - https://technet.microsoft.com/en-us/library/ms187874(v=sql.105).aspx
TSQL - https://msdn.microsoft.com/en-us/library/ms188388.aspx
I would suggest you to also refer one of the best index maintenance script as below:
https://ola.hallengren.com/sql-server-index-and-statistics-maintenance.html

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