Brain targeting is a research area focused on developing strategies and drug delivery systems that can effectively deliver therapeutics to the brain. This is particularly important for treating neurological disorders such as Alzheimer's disease, Parkinson's disease, and brain tumors, as the blood-brain barrier can limit the passage of drugs into the brain. Researchers in this field work to overcome these barriers by designing targeted delivery systems that can traverse the blood-brain barrier and deliver drugs specifically to the brain tissue, while minimizing systemic side effects. Techniques such as nanoparticles, liposomes, and cell-penetrating peptides are often employed to achieve brain targeting and improve the efficacy of treatments for brain-related diseases.