Sanders is not a Socialist, he just stands for a slightly different version of Capitalism. And Socialism is not about nationalisation, but about making the resources of the planet the common property of all the world’s people.
That's the difference between socialism and democratic socialism. Ever since Obama's election, the term "socialism" has been thrown around and used much too loosely, resulting in any kind of socialist policy to be labeled as socialism. Democratic socialism (even though Bernie is more of a social democrat) is a centrist idea with a small allowance of leftist policy, such as socialized health care and education. In short, democratic socialism is primarily capitalist with little snippets of socialist policy, and is entirely different from socialism.
The difference between socialism and democratic socialism is one of policy. Democratic socialists believe that the capitalism is the proper way to organize policy and that taxes and welfare should be used to offset the gains that go to the top. It is a lefter socialism or communism that does not believe in capitalism and desires that major industries be nationalized.
Democratic Socialist Federation was created in 1956.
Democratic Socialist Perspective was created in 1972.
Democratic Socialist Electoral League was created in 1998.
Democratic Socialist Electoral League ended in 2001.
Democratic Socialist Party - Japan - ended in 1994.
Democratic Socialist Party - Japan - was created in 1960.
Democratic Socialist Party of Greece was created in 1935.
Democratic Socialist Organizing Committee ended in 1982.
Democratic Socialist Party - France - ended in 1954.
Democratic Arab Socialist Union was created in 1980.
China Democratic Socialist Party was created in 1946.
Democratic Socialist Organizing Committee was created in 1973.