1. Isotonic: In an isotonic solution, the concentration of solutes is the same inside and outside the cell. This means there is no net movement of water across the cell membrane. The cell maintains its normal shape and function.

2. Hypertonic: In a hypertonic solution, the concentration of solutes is higher outside the cell than inside. Water moves out of the cell to try to balance the concentration, causing the cell to shrink or shrivel. This process is called plasmolysis.

3. Hypotonic: In a hypotonic solution, the concentration of solutes is lower outside the cell than inside. Water moves into the cell to try to balance the concentration, causing the cell to swell. If the difference in concentration is large enough, the cell may burst, a process called cytolysis.

Here's a simple analogy: Imagine a cell is like a balloon filled with water.

* Isotonic: The balloon is in a room with normal humidity. There's no net movement of water in or out of the balloon.

* Hypertonic: The balloon is placed in a room with very dry air. Water moves out of the balloon to try and balance the humidity, causing the balloon to shrink.

* Hypotonic: The balloon is placed in a room with very humid air. Water moves into the balloon to try and balance the humidity, causing the balloon to swell.