The Revolutionary Armed Forces of Colombia (Farc, after the initials in Spanish) are Colombia's largest rebel group.
They were founded in 1964 as the armed wing of the Communist Party and follow a Marxist-Leninist ideology.
Their main founders were small farmers and land workers who had banded together to fight against the staggering levels of inequality in Colombia at the time.
While the Farc have some urban groups, they have always been an overwhelmingly rural guerrilla organisation.