The social safety net is a collection of services provided by the state or other institutions such as friendly societies, including welfare, unemployment benefit, universal healthcare, homeless shelters, and sometimes subsidized services such as public transport, which prevent individuals from falling into poverty beyond a certain level.
A practical example of how the safety net works would be a single mother with several children, unable to work. By receiving money from the government to support her children, along with universal health care and free education, she can give her children a better chance at becoming successful members of society, rather than be caught up in the hopelessness of extreme poverty.