Widely used as a methylating agent in organic synthesis, particularly for transferring methyl groups to nucleophiles such as alcohols, thiols, and amines. It is effective in the preparation of methylated derivatives of various compounds, including pharmaceuticals and agrochemicals. The chemical is also employed in the synthesis of sulfur-containing organic molecules, where it acts as a key reagent for introducing methylthio groups. Its stability and reactivity under mild conditions make it a preferred choice in laboratory settings for selective methylation reactions. Additionally, it finds application in the modification of polymers and materials to enhance their properties.