Lipid droplets (LDs) are dynamic organelles that store neutral lipids, support cellular metabolism, and prevent lipotoxicity by sequestering lipids. This review discusses the mechanisms of LD biogenesis, lipid transfer between LDs and other organelles, and the role of LDs in regulating fatty acid flux and cell death. LDs are primarily composed of neutral lipids such as triacylglycerols (TAGs) and cholesterol esters, and their composition varies depending on the cell type and metabolic state. LDs are formed through the synthesis of neutral lipids in the endoplasmic reticulum (ER), which are then packaged into LDs via interactions with proteins such as seipin. The biogenesis of LDs is regulated by lipid phase separation, which allows for the formation of neutral lipid lenses that can grow through Ostwald ripening. LDs also play a critical role in lipid metabolism by facilitating lipid transfer between organelles and maintaining lipid homeostasis. LDs are involved in various cellular processes, including lipid storage, energy metabolism, and the regulation of lipid flux. They are also implicated in metabolic diseases, cancer, neurodegenerative disorders, and host-pathogen interactions. The biogenesis of LDs is influenced by the activity of enzymes such as DGAT1 and DGAT2, which are responsible for the final step of TAG synthesis. Additionally, the alternative pathway for TAG synthesis involves the enzyme DIESL, which can synthesize storage lipids using a phospholipid as an acyl donor. The regulation of LD biogenesis is also influenced by the interaction of proteins such as LDAF1 and seipin, which help to determine the site and efficiency of LD formation. LDs are also involved in the degradation of stored lipids through lipolysis and lipophagy. Lipolysis is mediated by lipases such as ATGL, HSL, and MGL, which hydrolyze TAGs stored in LDs to release free fatty acids. Lipophagy involves the delivery of LDs or portions of LDs to lysosomes for hydrolysis by lysosomal acid lipase (LAL). The regulation of lipolysis is influenced by the interaction of ATGL with CGI-58, which enhances its lipolytic activity. The inhibition of ATGL activity can lead to reduced lipolysis and increased lipid storage in LDs. LDs also play a role in lipid transfer between organelles, facilitated by lipid transfer proteins (LTPs) such as ORP5, ORP8, and ATG2. These proteins help to transfer lipids between membranes, enabling the exchange of lipids between LDs and other organelles. The regulation of lipid transfer is influenced by the interaction of LTPs with scramblases, which help to maintain membrane integrity and lipid concentration gradients. LDs are also involved in the regulation ofLipid droplets (LDs) are dynamic organelles that store neutral lipids, support cellular metabolism, and prevent lipotoxicity by sequestering lipids. This review discusses the mechanisms of LD biogenesis, lipid transfer between LDs and other organelles, and the role of LDs in regulating fatty acid flux and cell death. LDs are primarily composed of neutral lipids such as triacylglycerols (TAGs) and cholesterol esters, and their composition varies depending on the cell type and metabolic state. LDs are formed through the synthesis of neutral lipids in the endoplasmic reticulum (ER), which are then packaged into LDs via interactions with proteins such as seipin. The biogenesis of LDs is regulated by lipid phase separation, which allows for the formation of neutral lipid lenses that can grow through Ostwald ripening. LDs also play a critical role in lipid metabolism by facilitating lipid transfer between organelles and maintaining lipid homeostasis. LDs are involved in various cellular processes, including lipid storage, energy metabolism, and the regulation of lipid flux. They are also implicated in metabolic diseases, cancer, neurodegenerative disorders, and host-pathogen interactions. The biogenesis of LDs is influenced by the activity of enzymes such as DGAT1 and DGAT2, which are responsible for the final step of TAG synthesis. Additionally, the alternative pathway for TAG synthesis involves the enzyme DIESL, which can synthesize storage lipids using a phospholipid as an acyl donor. The regulation of LD biogenesis is also influenced by the interaction of proteins such as LDAF1 and seipin, which help to determine the site and efficiency of LD formation. LDs are also involved in the degradation of stored lipids through lipolysis and lipophagy. Lipolysis is mediated by lipases such as ATGL, HSL, and MGL, which hydrolyze TAGs stored in LDs to release free fatty acids. Lipophagy involves the delivery of LDs or portions of LDs to lysosomes for hydrolysis by lysosomal acid lipase (LAL). The regulation of lipolysis is influenced by the interaction of ATGL with CGI-58, which enhances its lipolytic activity. The inhibition of ATGL activity can lead to reduced lipolysis and increased lipid storage in LDs. LDs also play a role in lipid transfer between organelles, facilitated by lipid transfer proteins (LTPs) such as ORP5, ORP8, and ATG2. These proteins help to transfer lipids between membranes, enabling the exchange of lipids between LDs and other organelles. The regulation of lipid transfer is influenced by the interaction of LTPs with scramblases, which help to maintain membrane integrity and lipid concentration gradients. LDs are also involved in the regulation of