In America, Social Security  play a vital role in helping people with disabilities to live independently in the community and meet their basic needs. 
in America, the definition of disability and the sequential evaluation process for SSI children (individuals under age 18) is similar to that for adults, but disability is determined according to the severity of the physical or mental impairment(s) and not according to vocational factors. For children, the impairment(s) must cause "marked and severe functional limitations," which means the child's impairment must meet, be medically equal to, or be functionally equal to the medical impairment listings.

Social protections crucial for older persons, persons with disabilities
Social pensions are a critical element of the right to social security for older persons whose human rights enjoyment is endangered without an adequate social pension. Older women are especially at risk. They live longer, and the unpaid care work they perform throughout their life obstructs their ability to access formal employment and therefore contributory social security or decent wages. Social and economic policies should correct this imbalance by promoting equality between women and men instead of deepening the gap. Childcare, for example, should be guaranteed as a social protection measure. The level of benefits for social pensions must ensure an adequate standard of living.

Social protection is key for persons with disabilities to gain independence from families, boost their social participation and support their ability to live with dignity. It can enhance the productivity, employability and economic development of persons with disabilities, and therefore contribute to their income security.
The Social Security insurance programs are funded by the payroll contributions of covered workers and their employers.
The Social Security disability program includes work incentive provisions and access to vocational rehabilitation services to promote return to work. The Ticket to Work and Work Incentive Improvement Act, enacted on December 17, 1999, includes several important new opportunities for people who receive Social Security disability benefits and want to go to work. The law increased beneficiaries' choices in obtaining rehabilitation and vocational services to help them go to work and attain their employment goals,
removed barriers that require people with disabilities to choose between health care coverage and work, and ensured that more people with disabilities have the opportunity to participate in the workforce and lessen their dependence on public benefits.

An insured worker's disability benefits may be terminated for several reasons. The three most common reasons are the following:

The beneficiary attains the full retirement age. When the worker reaches full retirement age, the benefit is automatically converted to a retired- worker benefit. Approximately 43 percent of terminations of disabled-worker benefits in 2005 were conversions to retired-worker benefits.
The beneficiary dies. Approximately 41 percent of terminations of disabled-worker benefits in 2005 were due to the death of the disabled worker.
The disabled beneficiary is no longer disabled. Beneficiaries who have had a medical recovery or successful reentry to the workforce are removed from the disability rolls. Approximately 13 percent of terminations of insured disabled-worker beneficiaries in 2005 were the result of medical recovery or work above the substantial gainful activity (SGA) level.
Supplemental Security Income for the Blind and Disabled
The SSI program is a means-tested, federally administered income assistance program that was enacted in 1972 (Public Law 96-603) and began in 1974. The program provides monthly cash payments to aged, disabled, and blind individuals who meet income and resource limits as well as the medical eligibility requirements. The SSI program replaced the state-administered Old-Age Assistance means-tested programs for individuals aged 65 or older. For the blind and disabled, it replaced the federally mandated programs of Aid to the Blind, which were established in the original 1935 Social Security Act, and Aid to the Permanently and Totally Disabled, which was established in the 1950 Amendments to the Social Security Act. Payments may be made only to the disabled individual, not to dependents of the disabled person. 
Social Security has a disability program called Supplemental Security Income (SSI) that can provide monthly income support for lower-income families who care for children with developmental and behavioral disabilities, as well as physical impairments. Children with developmental disabilities like autism and intellectual disability, as well as other behavioral health impairments like bipolar disorder and schizophrenia, may qualify for SSI.

Families of children with disabilities often have higher out-of-pocket costs and additional demands on their time. This can lead to more financial instability. Children with disabilities may be in diapers for a longer period, they may need behavioral incentives to learn new skills, or they may require specialized equipment not covered by insurance. Monthly SSI payments help reduce the struggles families experience and provide the financial support their children need.

SSI can enable a child’s access to health insurance. In most states, people receiving SSI are automatically eligible for Medicaid. Medicaid covers essential long-term services and support that is typically unavailable through private insurance. Services like personal and home care assistance help ensure children can continue to receive care. In addition to medical services, Medicaid can also cover eyeglasses, hearing aids, wheelchairs, lifts, and supportive housing services. The home modifications and equipment allow family members to care for children at home.

SSI plays a critical role for children with disabilities and their families by providing needed financial support and access to Medicaid.