Digital shearing speckle pattern interferometry (DSSPI), also named shearography, is an extensively researched non-contact high-sensitivity optical measurement method. The recent development of shearography, ranging from key technologies to applications is presented in detail within this paper. The new technologies of shearography, such as spatial phase-shifting shear interferometry, multi-directional shear interferometry, and multi-functional multiplex measurement, are described in detail, and their applications in nondestructive testing in aerospace, automobile, machinery, new materials, and other fields are introduced. At the end of the article, the pros and cons of shearography are analyzed, and the potential research content is discussed.