Myeloid cells are a group of white blood cells that are derived from hematopoietic stem cells in the bone marrow. They play a crucial role in the immune system by identifying and destroying pathogens, as well as regulating inflammation and tissue repair. Myeloid cells include various types of cells such as macrophages, monocytes, neutrophils, dendritic cells, and mast cells. Research on myeloid cells focuses on understanding their development, function, and interactions with other immune cells. Scientists study how myeloid cells respond to different stimuli, such as infection or injury, and how dysregulation of myeloid cell activity can lead to diseases such as cancer, autoimmune disorders, and chronic inflammation. Furthermore, myeloid cells have been the target of research for developing immunotherapies and vaccines to combat various diseases. Understanding the role of myeloid cells in the immune response is essential for developing new treatments and therapies to improve human health.