The term cold was used because there was no large-scale fighting directly between the two sides. although there were major regional wars, known as proxy wars, supported by the two sides.
The cold war split the temporary wartime alliance against Nazi Germany leaving the USSR and the US as two superpowers with profound economic and political differences.
Communism - a political theory derived from Karl Marx, advocating class war and leading to a society in which all property is publicly owned and is paid according to their abilities and needs.
Capitalism - an economic political system in which a countrys trade and indutry are controlled by private owners for profit rather than by the state.