Quantum information masking, an emerging concept in quantum information processing, refers to the complete quantum information transfer from a single quantum carrier to the correlations of multiple quantum carriers, so that any single carrier no longer contains any information of the pre-masked state. Quantum information masking has applications in the fields such as qubit commitment and secret sharing; however, similar to operations like the cloning, broadcasting, and hiding of quantum states, masking of quantum information cannot be accomplished with a universal bipartite isometry. We will provide a systematical introduction of recent progress about quantum information masking: firstly, we will describe the geometric characteristics of the maskable set, discuss the realization of the masking operation, its information-theoretical implication and its relationship with quantum error correction; secondly, we will present the experimental realizations of quantum information masking, expound the feasibility of quantum information masking in complex systems such as high-dimensional systems, and demonstrate its application in quantum secret sharing and noise-resilient quantum communication.