Solid lipid nanoparticles (SLN) might provide fresh opportunities for treating challenging ailments. The SLN were established in the 1990s to replace emulsions and liposomes, in addition to polymeric nanoparticles (NP) as carrier systems. SLN are wet cohesive dispersions with solid biodegradable lipids as their matrices. Drug delivery techniques called SLN use both liquid and solid lipids as their primary matrices. It was demonstrated that SLNs have several benefits over conventional carriers for drug therapy, a longer half-life, tissue-targeted administration, higher permeability, enhanced bioavailability, enhanced solubility, as well as the capacity to enhance storage stability. Because of their exclusive size-dependent characteristics as well as their capability towards incorporating drugs, SLN’s currently a possibility towards designing promising pharmacological prototypes for drug transport as well as targeting. The objective of tailored as well as monitored drug delivery is now unsettling researchers’ interests across the globe, and can be accomplished through the support of SLNs. The present investigation emphasizes SLNs’ numerous characteristics as well as development and evaluation processes, formulation factors, delivery routes, surface changes, toxicity, and biomedical applications