Vimentin is a type of protein known as an intermediate filament, which plays a crucial role in maintaining the structural integrity of cells. It is primarily found in mesenchymal cells, which are involved in the formation of connective tissues, and helps provide mechanical support and stability to the cell's shape. In addition to its structural role, vimentin is also involved in various cellular processes, including cell migration and signaling. It is often used as a marker in research to identify certain types of cells, particularly in studies related to cancer and tissue regeneration.