The Cuban Revolution explained simply -Che Guevara & Fidel Castro

The Cuban Revolution was an armed revolt conducted by Fidel Castro's revolutionary 26th of July Movement and its allies against the military dictatorship of Cuban President Fulgencio Batista.
The revolution began in July 1953, and continued sporadically until the rebels finally ousted Batista on 31 December 1958, replacing his government. In June 1955, Fidel met the Argentine revolutionary Ernesto "Che" Guevara, who joined his cause.
26 July 1953 is celebrated in Cuba as the Day of the Revolution.
The 26th of July Movement later reformed along Marxist–Leninist lines, becoming the Communist Party of Cuba in October 1965.

The Cuban Revolution had powerful domestic and international repercussions.
In the immediate aftermath of the revolution, Castro's government began a program of nationalization, centralization of the press and political consolidation that transformed Cuba's economy and civil society.