This document provides an overview of cell cycle regulation and control. It discusses: 1) How multicellular organisms coordinate cell division across tissues through regulating the timing and rates of cell division. 2) The cell cycle phases (interphase and mitosis) and checkpoints (G1/S, G2/M, spindle) that ensure DNA replication and chromosome separation occur correctly. 3) Factors that control the cell cycle, including cyclins, cyclin-dependent kinases (Cdks), and growth factors, which promote or inhibit cell division through phosphorylation. Cancer occurs when these control mechanisms fail.