@noorul Well basically, communism is about the workers controlling the companies, and by extension the whole state. In capitalist countries, comanies are owned by individuals, whose goal it is to make a profit. That means they cant really care about things like workers rights or pollution, because it would cut into their profits. If the companies are controlled by the workers instead, they will use that power in their best interests, like improving working conditions, or protecting the environment, not for increasing profits.
The capitalists are not going to give their property away for free, because obviously they prefer the current state of things. Thats why we need a revolution to get rid of capitalism.
And most countries today are capitalist, thats why the media is generally controlled by capitalists, and defends their interests (by attacking communism as evil or bad).