It was the mujaheddin versus the Communist part of Afghanistan. It lasted 3 years and was caused by the chaos after the soviets left Afghanistan. After several years of fighting, the government fell in 1992. However, the civil war continued with fighting between the government, and insurgents such as the Taliban attempting to bring down the government that they accused of corruption. If this did not happen there might not be so much instability in the country, as it is now.