Simply put:

• The Bolshevik Revolution (1917) overthrew the Russian Provisional Government (which had replaced the Tsar earlier that year)
• It led to the Bolsheviks taking power and establishing a socialist state
• After a civil war, this became the USSR (Soviet Union) in 1922

Simple version:

It was the revolution that ended the Russian Empire’s system and eventually led to the creation of the USSR. ⭐

The Bolshevik Revolution was the seizure of state power in Russia by the Bolshevik (radical socialist/Marxist) faction of the Russian Social Democratic Labor Party, led by Vladimir Lenin, in October–November 1917 (Old Style calendar: October 25; New Style: November 7).

It ultimately “ended” in the sense of completing its revolutionary phase when the Bolsheviks consolidated control through victory in the Russian Civil War and then created the Union of Soviet Socialist Republics (USSR) in late 1922, institutionalizing their rule as a new one‐party state.

What it was

How it unfolded after 1917

How and when it “ended”

So, in brief: the Bolshevik Revolution was the 1917 radical socialist overthrow of the Russian Provisional Government and the creation of a Soviet regime, and it “ended” as a revolution once the Bolsheviks had won the civil war and consolidated their power in the form of the USSR by 1922.

• Sources