Generally people think that export happens when goods or services actually go out of the country. But that is not the case. The Govt of India, has defined some circumstances where, even though goods do not leave the country, they are consdered as have been exported. These cases are called by the lawmaker as "deemed exports". for example: when a person sells goods to SEZ, it may be called as a deemed export.
As per GST supply of goods/services shall be considered as deemed export when:-
The following categories of supply of goods by the main/ sub-contractors shall be regarded as "Deemed Exports" under this Policy, provided the goods are manufactured in India:
under International Competitive Bidding in accordance with the procedures of those agencies/ funds, where the legal agreements provide for tender evaluation without including the customs duty;