What is a clear definition of the Korean War?

Korean War refers primarily to war between North Korea and
south Korea that began on June 25, 1950 and ended on July 27, 1953. This is the first
war in which United Nations Played a Military Role. On behalf of UN 16 countries sent
their troops to fight on in this war in support of South Korea, and 41 countries sent
military equipment, food and other supplies.

However, USSR
supported North Korea by supplying them military equipment. China fought this war on the
side of North Korea.

The primary causes of the Korean war
was the division of Korea in North and South, after World War II. The North Korea was
occupied and controlled by USSR while South Korea was controlled by USA. This division
of the country came in way of forming a unified government for the whole country.
Instead separate governments in each part were formed that claimed control over the
entire country. This resulted in war between the two
side.

The Korean war ended with the signing of an armistice
between the two sides. However till date there is no permanent peace agreement between
them.