There was a party in Russia a long time ago called the Russian Social Democratic Labour Party. They wanted to make life better for people who were poor and didn't have a lot of money. They thought everyone should be equal and have the same rights.
The party wanted to make some big changes to the way things were run in Russia. They thought that the government should be more fair to the people and help them out when they needed it. They also wanted to make sure that workers were treated fairly and paid enough money for the work they did.
However, not everyone in the party agreed on how best to achieve their goals. Some members thought that they should use peaceful protests and try to change things slowly, while others believed in more radical action, like protests that involved violence or even fighting against the government.
Eventually, the party split into two groups, each with their own ideas on what was best. One of these groups was led by a man named Lenin, and they believed that the only way to bring about real change was through a revolution - a big, sudden upheaval where the people would take over the government and create a new, fairer system.
The Russian Social Democratic Labour Party ended up playing a big role in the events that led to the Russian Revolution of 1917, which changed the country's government and society in many ways.