Cytotoxicity is a big word that describes how certain cells can be harmful to other cells. You see, our bodies are made up of tiny cells that do different jobs to keep us healthy. But sometimes, other cells can come to harm them, and that's where cytotoxicity comes in.
There are some immune cells in our bodies that have a special power to find and kill cells that don't belong or are unhealthy. They use special weapons to do so, like poison or proteins that can break apart the cells they are targeting. Imagine the immune cells with tiny swords and guns, that is cytotoxicity in action!
This can happen if there are viruses or bacteria trying to infect our body or if some of our cells are not growing the right way, like in cancer. The immune cells do a great job of getting rid of these unhealthy cells, but sometimes they can also attack healthy cells and cause damage.
So, we need to be careful when using certain medical treatments or drugs that can cause cytotoxicity. They may be targeting unhealthy cells, but they can also harm healthy ones too. Scientists are studying cytotoxicity to find ways to make it more targeted and less harmful to healthy cells, so that we can have better treatments for diseases like cancer.