What is the Socialism?

Socialism is the one of suggestion to solve capitalism problem that the rich richer, the poor poorer, poor working conditions, living environment issues, child labor, unemployment, social inequality problems, environmental pollution, etc

so they think Nation should be solve this problem to lead.

Equality was a more specific way. It's think of communist that every worker get money how much they worked and everyone be equal status, society that no discrimination.

Socialism does not deny private property.
Purpose of capitalism is making more money they could. Socialism is anti-capitalism to solve social problems by applying limited to this.

So which country is now the socialist countries ?
We can found in almost all of capitalism, democracy country. 
Also South Korea is found concept of socialism everywhere.
Health care system, retirement system, pension system, weekly working time limits, minimum wage is the socialist concept.