The term "susceptible" refers to being easily affected or harmed by external factors. This can apply to individuals, groups, or systems that lack resistance to certain influences, such as diseases, environmental changes, or social pressures. For example, children and the elderly are often considered more susceptible to illnesses like the flu due to their weaker immune systems. In a broader context, susceptibility can also relate to emotional or psychological vulnerability. People who are susceptible to stress may find it challenging to cope with demanding situations, making them more likely to experience anxiety or depression. Understanding susceptibility helps in developing strategies for protection and support in various areas of life.