Hello,

DASA stands for Direct Admission for Students Abroad.

Direct admission of students abroad (DASA) is a Scheme of Ministry of Human Resource Development, Government of India For Foreign Nationals/Persons of Indian Origin (PIOs)/Non-Resident Indians (NRIs)/ Overseas Citizen of India (OCI) Admissions to Premier Institutions of India (NITs, IIEST, IIITs, SPAs, Central Universities and Other Centrally Funded & Premier Technical Institutes)  for Undergraduate  programmes in Engineering/Architecture/ Planning and Postgraduate programmes (M.Tech./M.Arch./M.Plan./M.Des./MURP & MBA) .

Every year, one NIT coordinate for admission process through DASA. The admissions to various UG and PG programmes of premier Institutes of India under the DASA scheme was coordinated by Visvesvaraya National Institute of Technology Nagpur INDIA for the year 2017-18.

You can check complete details about DASA by below dasa website:
DASA Offcial Website

You can refer to this link also

https://engineering.careers360.com/articles/dasa-ug