In recent years, hand gesture has been widely used in human-computer interaction, virtual reality, and other fields as an input channel. Especially, with the emergence of advanced technology of human-computer interaction and the rapid development of computer technology (such as deep learning, GPU, parallel computation technology, etc.), gesture understanding and interaction methods have made breakthroughs. This paper reviews the research progress of dynamic gesture understanding and typical interaction applications. Firstly, the core concepts of gesture interactions are elaborated. Secondly, the progress of dynamic gesture recognition and detection is introduced. Thirdly, the representative applications of dynamic gesture interaction are elaborated. Finally, the future development trend of gesture interaction is discussed.