Original sentence: Social security refers to variety of government programs providing for social welfare and social protection and the alleviation of poverty among senior citizens.These services typically include provision for retirement pensions, disability insurance, survivor benefits, medical care, and unemployment insurance
Edited sentence: Social security mainly refers to a field of social welfare concerned with social protection, or protection against socially recognized needs.These services typically include provision for old age, disability and provision for survivors; in many welfare states they might also include medical care and unemployment