Plant untargeted lipidomics refers to the comprehensive analysis of lipids in plant systems without any prior bias or targeting of specific lipid species. This method uses high-resolution analytical techniques to capture a full spectrum of lipid classes, from common fatty acids to complex phospholipids, sphingolipids, and other specialized lipid molecules. The "untargeted" nature of the analysis means that it allows for the detection of a wide array of lipids, including those that are novel or not previously studied.