Collection of scientific works on the materials of the XXI International Scientific and Practical Conference "Scientific Research : Key Challenges” is a unique and informative collection that will become an indispensable source for scientists, researchers and specialists seeking to keep abreast of the latest achievements in science and practice. This collection is a fruitful collection of articles, reports and analytical materials prepared by the participants of a prestigious international conference that brings together leading scientists from around the world. The book reveals a wide range of current topics, covering modern areas of research, innovative methods and advanced technologies used in various fields of science. It contains materials on new approaches in engineering, information technology, biotechnology, ecology and many other disciplines, making it a valuable resource for those who are looking for fresh ideas and solutions to the complex problems of our time. Special attention is paid to interdisciplinary research, which is becoming the key to the development of new technologies and methods that can change the future. This publication is intended for scientists, graduate students, teachers and practitioners interested in an in-depth understanding of modern scientific trends. It is perfect for professionals working in scientific laboratories, innovative companies and educational institutions, as well as for students seeking to expand their knowledge and prepare for participation in international projects. Age range of readers - from young researchers to experienced scientists looking for fresh ideas and new approaches The peculiarity of this collection is its relevance and practical focus. It raises important topics related to the challenges of the modern world, such as sustainable development, digitalization, environmental safety and innovative research methods. Each article is the result of the hard work of scientists seeking to contribute to the development of their field and solve the pressing problems of society. Due to the strict scientific style and careful review, the materials of the collection are distinguished by a high level of reliability and practical value .. The author's style, although unknown, demonstrates a deep understanding of current trends and trends in scientific communication. The collection traces the desire for clarity, consistency and accessibility of the presentation of complex ideas, which makes it a valuable tool for training and professional development. This collection is a continuation of the traditions of international conferences that bring together scientists to exchange knowledge, experience and new discoveries. If you are looking for a source of inspiration, relevant research and fresh ideas, the “Collection of scientific works on the materials of the XXI International Scientific and Practical Conference “Scientific Research: Key Problems” will be an excellent addition to your library. It will help you stay on the crest of scientific waves, expand the horizons of knowledge and find new ways to solve complex problems. This collection is not just a collection of articles, but a real map of the modern scientific world, which opens doors to the future of science and practice.