The Indo-Sri Lanka International Webinar, 2021 (ISW-21) conducted under the Indo-Lanka joint research program, was successfully held on the 8th and 9th March 2021. The webinar was organized collaboratively by Prof. Anushree Malik of the Centre for Rural Development and Technology, Indian Institute of Technology Delhi, India, and Dr. Thilini U. Ariyadasa of the Department of Chemical and Process Engineering, University of Moratuwa, Sri Lanka.