Medicaid is a government program that provides healthcare assistance to low-income individuals and families. It is specifically designed to help those who have limited financial resources and cannot afford medical insurance or healthcare expenses. Medicaid offers a wide range of services, including doctor visits, hospital stays, prescription medications, and preventive care. Eligibility for Medicaid is based on income level and other factors such as age, disability, and family size. Therefore, the correct answer "assistance for low income people" accurately describes the main purpose of Medicaid.