Immune cells are split into two main categories:
1. Myeloid lineage (mostly innate function):
-Monocytes, Macrophages, Neutrophils, Eosinophils, Basophils, Mast cells
Dendritic cells can be derived from both myeloid and lymphoid lineage, however usually classed under myeloid.
2. Lymphoid lineage (mostly adaptive function):
-B-cells, T-cells (Cytotoxic, helper, and regulatory)
-Natural Killer cells are lymphoid cells, however are highly involved in innate immune responses.
Note: Cells from both myeloid and lymphoid lineages can both directly and indirectly interact with one another to communicate and set up an immune response.
Other immune factors including cytokines, complement and immunoglobulins also assist with the development of immunity. These are not cells, they are (most often) highly specific proteins secreted by different immune and non-immune cell types.