Lens arrays, composed of multiple lenses arranged in a specific configuration, are versatile optical components. In contrast to individual lenses, lens arrays have the capability to capture a greater amount of spatial light field information, thereby enabling functionalities such as high-speed motion detection, three-dimensional light field imaging, and parallel information processing. Recently, researchers have developed metalens arrays that preserve the capabilities of traditional microlens arrays while offering advantages such as flexible design and ultra-lightweight features. The unique attributes of metalens arrays endow them with notable prospects for application in the miniaturization, intelligence, and integration of optical devices and systems. This article describes the working principles of lens arrays, successful applications of metalens arrays in imaging and information technology, and presents a prospective outlook on the future development of metalens arrays.