The **International Student Science Fair (ISSF)** is an annual gathering of high school students and teachers from around the world, organized by the International Science Schools Network (ISSN) and hosted each year by one of its member schools (such as science-focused high schools in countries like Australia, Thailand, Korea, and others). The event typically includes student research presentations, poster sessions, lab visits, keynote lectures, and cultural exchange activities, all centered on contemporary themes in science and technology. Participation is generally **by school delegation**, not individual application: invited or member schools of the ISSN select teams of students—usually upper secondary/high school level—to attend and present original science projects. While it is not a “competition” in the strict sense with large cash prizes, there are often structured presentation sessions, feedback from scientists and educators, and sometimes awards or recognitions. Students benefit from international networking, exposure to advanced research topics, and opportunities to practice scientific communication in an English-speaking, global environment.