Vulnerability refers to conditions that affect a community's ability to prepare for and respond to hazards. It exists prior to disasters and contributes to their severity. Vulnerability comes from a lack of protection, such as from deforestation exposing soil. Disaster preparedness involves predicting and preventing disasters, while mitigation lessens their effects through measures like improving building structural quality. More vulnerable groups have special needs during disasters and difficulty accessing standard resources. The most vulnerable sectors have low capacities and difficulty withstanding disasters, such as farmers, urban poor, and disabled people. Less vulnerable sectors have more material resources and skills to overcome disasters, like professionals.