Hello Sweta
A host organisation is the organisation where an individual applicant proposes to undertake their Endeavour Leadership Activity. It is the responsibility of applicant to find the appropriate host organisation.
You can go through the example application form, applicant guide for detailed information-

https://internationaleducation.gov.au/Endeavour%20program/Scholarships-and-Fellowships/Applications/Documents/UPDATED%20Individual%20Applicants%20Guide%20for%20the%20Endeavour%20Leadership%20Program%202019%20Round.pdf

https://internationaleducation.gov.au/Endeavour%20program/Scholarships-and-Fellowships/Applications/Documents/Example%20Application%20Form.pdf

Good Luck!

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