Hint: In Protists and Monerans, cell division is considered to be a mode of reproduction.
Complete answer: Cell division the process in which a parent cell divides, giving rise to two or more daughter cells from one progenitor cell (in bacteria and protists).
This is also referred to as asexual cell division as evidently there is no involvement of sexual union of two individual cells. It is especially the process used by organisms in order to grow, reproduce, and replenish the damaged tissues or cells in the body.
In prokaryotes, the unicellular ones, binary fission is the main type of cell division that is dominantly used to proliferate. In unicellular eukaryotes, mitosis and meiosis (reductional division) both cell division types are present.
Protists can reproduce asexually through binary fission (division of one nucleus), multiple fission (division of many nuclei), and budding. During both types of fission, the organism replicates its nucleus and divides to form new organisms.
Note: Eukaryotes also use the mode of asexual cell division, also making two identical daughter cells from one progenitor cell. This is found in the somatic cells. This is the type of cell division that also occurs in the fertilized egg cell i.e. the zygote, that ultimately after repeated divisions becomes the fetus.