The process of cell division is called “mitosis”.
The period between two cell divisions is called “Interphase”.
This is actually the period when the genetic material makes it’s copy so that it is equally distributed to the daughter cells during mitosis. Interphase can be devided into three phases.
G1 Phase: This is the linking period between the completion of mitosis and the beginning of DNA replication (GAP-1 Phase). The cell size increase during this period.
S Phase: This is the period of DNA synthesis (Synthesis phase) leading duplication of chromosomes.
G2 Phase: This is the time between the end of DNA replication and the beginning of mitosis. Cell organells devide and prepare chromosome for mitosis.