What do you mean by ozone hole? What are its consequences?

(N/A) The ozone hole refers to the significant thinning of the stratospheric ozone layer,primarily caused by the release of chlorofluorocarbons $(CFCs)$ and other ozone-depleting substances.
Consequences of ozone depletion:
$1$. Increased $UV$ radiation reaching the troposphere leads to health issues such as skin ageing,cataracts,sunburn,and skin cancer.
$2$. It negatively impacts aquatic life by killing many phytoplanktons,which damages fish productivity.
$3$. Plant proteins are affected by $UV$ radiation,leading to harmful mutations in cells.
$4$. It increases the evaporation of surface water through the stomata of leaves,thereby decreasing the moisture content of the soil.
$5$. Increased $UV$ radiation causes damage to paints and fibers,leading to faster fading.