Susceptibility refers to the likelihood of being affected by a particular condition or influence. This can apply to various contexts, such as health, where individuals may be more prone to diseases due to genetic factors, environmental influences, or lifestyle choices. For example, people with weakened immune systems may show higher susceptibility to infections. In psychology, susceptibility can describe how easily a person can be influenced by external factors, such as peer pressure or advertising. Understanding susceptibility helps in developing strategies for prevention and intervention, whether in health care or behavioral change initiatives.