Climate change and related hazards  affect many aspects of people's lives- such as their health, access to food and housing, or their source of income such as crops or fish stocks-and many will have to adapt their way of life in order to deal with these impacts. People who are poor and have few resources with which to adapt are thus much more seriously negatively affected by climate-related hazards. 'Vulnerability' is when a person or community is not able to cope and adapt to climate-related hazards. For example, if someone who is very rich has their house washed away in a flood, this is terrible, but they often have more resources to rebuild, have insurances that support recovery and maybe even build a house that is not in a flood-prone area. Whereas for someone who is very poor and who does not live in a state that provides support, the loss of their house in a flood could mean homelessness. This example shows that the same climate hazard  can have a very different impact on people depending on their vulnerability .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report