what does capitalism,democratic socialism and communism are alike and different?

Answer 1

You're mixing economic and political forms together. But limiting just to economic forms, here's an analogy to explain.

You are a farmer, and you grow strawberries (luxury goods) and wheat (necessity) for the community.

Capitalism: You own the fields. You do the work. You charge whatever you want for your crops. You might get taxed.

Socialism: You own the strawberry patches, and the community owns the wheat fields. You do the work, and get paid for it. You get to keep or sell the strawberries. The community gets the wheat, and you get a share.

Communism: The community owns the fields. You do the work and you don't get paid for it. The community gets all the crops, and you get a share.

The only thing that makes Democratic Socialism different from any other form of socialism is the the decision-making power is held by the community, rather than being held by a dictator or some other group that makes the decisions without democratic input.

Answer 2

Capitalism is the pursuit of free enterprise, with all its excesses and flaws, as well as its benefits. Communism is , ideally, the sharing in both the work and the profit to be had by a given people. Problem is, the guys on the top get the lion's share, and spend lots of it making sure the guys on the bottom stay there. Democratic socialism is much the same system, but with the illusion that you have a say in the matter.
The truth is that any government which includes humans will end up corrupt, no matter with what good intentions it was begun. The nature of the beast, that those in ascendancy will always take their cut off the top. And do everything in their power to be sure they stay at the top. No governmental model works unless every single one of the governed has a voice, and pays attention to what its government is doing. Just like in school, you have to keep an eye on the buggers.