We are pleased to announce that the 2nd International Sisli Science Congress , will be held as online, between the dates 27th and 28th of May, 2021 in Istanbul, Turkey. International Sisli Science Congress is an annual conference that brings together researchers, scientists, academics, scholars, students and administrators working in different disciplines. For this purpose,we are organizing the 2nd International Sisli Science Congress, in collaboration with University of “Angel Kanchev”, Ruse. The cooperation of our congress will be contributing to strengthening of our international academic collaboration as well. Due to the ongoing coronavirus pandemic, the 2nd International Sisli Science Congress will be held as online. We would like to thank you in advance for your participation and support. We are looking forward to receiving your papers and participation in due time of the Congress.