Collectivism holds that the individual is not an end in oneself, but is a tool to serve the ends of collective.
“The political expression of altruism is collectivism or statism, which holds that man’s life and work belong to the state—to society, to the group, the gang, the race, the nation—and that the state may dispose of him in any way it pleases for the sake of whatever it deems to be its own tribal, collective good.” — AYN RAND 
Collectivism holds that the individual is not an end in oneself, but is a tool to serve the ends of others (the collective). Whereas, individualism declares that every individual should live their life for their happiness, as an end to oneself; collectivism holds the group as the primary and the standard of moral value. Whether that group is a dictator’s gang, the nation, society, the race, the gods, the majority, the community, or the tribe is merely a matter of detail.
The individual’s moral purpose is as a sacrificial victim, whose value is the ability to sacrifice one’s life, liberty and happiness to the will of the group.