In the interphase, a cell prepares itself for mitosis by growing in size metabolically active and doing its day to day functions, since this is not an actively dividing state it is also called the resting phase of the cell.

Why is interphase called the resting stage?

The three main phases of a single cell cycle are: interphase, nuclear division and cytoplasmic division. Originally this phase of the cell cycle was called the "resting stage", since light microscopy could not detect any activities taking place within the cells.

Is interphase a resting phase?

Resting phase: More appropriately called interphase. The interval in the cell cycle between two cell divisions when the individual chromosomes cannot be distinguished, interphase was once thought to be the resting phase but it is far from a time of rest for the cell.