Socialism, Communism, Democracy

What is Socialism? Socialism according to the dictionary is: 1. (In Marxist theory) the stage following capitalism in the transition of a society to communism, characterized by the imperfect implementation of collectivist principles, Or 2. A theory or system of social organization that advocates the vesting of the ownership and control of the means of production and distribution, of capital, land, etc., in the community as a whole. In my words, Socialism is a system of social organization that to Karl Marx was the first step to true communism, it supposedly consists on communist ideals of equal distribution except that its all controlled by a central power that owns it.

Communism according to the dictionary is: 1. A theory or system of social organization based on the holding of all property in common, actual ownership being ascribed to the community as a whole or to the state. 2.  A system of social organization in which all economic and social activity is controlled by a totalitarian state dominated by a single and self-perpetuating political party. My definition is a system of social organization developed by Marx, Engels, and Stalin, whose goal is to eliminate social levels, inequality, and monetary systems. "To each depending on necessities, and each depending on his dedication" is the definition of equality.

Democracy according to the dictionary is: 1. A form of government in which the supreme power is vested in the people and exercised directly by them or by their elected agents under a free electoral system. In my words a democracy is a type of government/ system of social organization where decisions are on popular vote.

So which is better? Is anyone of these the ideal government or could it be something else? Pros? Cons? If the whole world where to become one of these, which one would improve overall lifestyles the most? Which one would eliminate issues such as hunger, homelessness, pollution, over population, poverty, sustainable resources, etc.?