Social welfare is a term that is often used in connection with the field of social work. Social workers are said to work for social welfare. If this is what you are asking about (since you tagged this with "social work"), there are many areas that are considered the business of social welfare.
Social welfare is concerned with anything that has to do with improving the lives of people who are in some way disadvantaged. This means that practically anything can be the “business” of social work. Among the things that social workers could be concerned with are:
- Addiction. Social workers might try to help people break their addictions so they can lead productive lives.
- Domestic violence. Social workers might try to get women out of bad home situations so they and their children can live without fear of being abused.
- Unemployment. Social workers might try to help people who are unemployed get government benefits. They might also try to help them find jobs or the training that would be needed in order to get a job.
- These are only a few of the things that are the business of social welfare/social work. Anything that could be relevant to improving the lives of disadvantaged people could be seen as part of social work.