4-Iodo-N-Hydroxybenzamide is a histone deacetylase (HDAC) inhibitor utilized in biochemical research to study protein modifications, gene expression control, and chromatin structure remodeling in cells. It serves as a key intermediate and building block in organic synthesis for pharmaceuticals and bioactive compounds, including advanced HDAC inhibitors for cancer treatment. The iodine group enables its use in radiolabeling studies for biomedical imaging and tracer applications. It also demonstrates potential in developing antimicrobial and antitumor agents via structural modifications and is employed in cross-coupling reactions, such as Suzuki and Heck reactions, to build complex aromatic systems in drug discovery.