Soldat
In short
A soldier is a person who serves in an army or military force to defend a country or fight in wars.
In plain words
They follow orders from leaders to protect their nation. Soldiers undergo intense training to learn how to use weapons and work in teams. They often live in camps or deploy to different parts of the world.
A simple example
A soldier might stand guard at a border to prevent unauthorised crossings. They may also help deliver food and medicine during a natural disaster.
Why it matters
Soldiers provide the physical force needed to maintain national security and peace. Without them, a country would have no way to defend itself from external threats.
Easy to mix up
Do not confuse a soldier with a mercenary, who is a person hired specifically for profit rather than national duty.