In situ synthesis refers to the formation of nanomaterials directly within a host matrix or in the desired location where they will be used. This method contrasts with ex situ synthesis, where nanomaterials are produced separately and then integrated into their final application. In situ synthesis is particularly advantageous in nanotechnology because it allows for precise control over the size, shape, and distribution of nanoparticles, which are critical parameters for their performance in various applications.