Every year on the 11 November we remember the people who lost their lives fighting for the UK in wars and battles.
That day is important because it marks the moment the First World War ended, at 11am on the 11th day of the 11th month of the year 1918.
We also remember them on Remembrance Day, which is the second Sunday in November every year. There is a two-minute silence to remember those who lost their lives.
There are very few people now still alive who fought in the First World War, but some of your grandparents, or great-grandparents may have been involved.
Press Packer Stephanie decided to find out about her relatives who fought for the country.
"Over the past few weeks I have been studying my family history, going back through World War 2 and even World War 1.
I have discovered many interesting and wonderful facts and stories. I have been able to look at some of the old documents and medals that belong to my grandparents.
It was very interesting to look back over the memories of my family and what they did during the first and second World Wars.
Stephanie's Grandad Leo and Grandpa Ken
During World War 2 my grandad was in the Royal Air Force (RAF), and he had to fix the planes if they got damaged.
My grandma, at 14, was too old to be evacuated, so she had to stay behind and work.
My grandpa fought in West Africa and in Burma. My grannie worked by welding the tanks together.
I am very proud of what they did because they helped to protect our country.
It is not hard to trace your family history. You can go to museums, read books and talk to your family. You might be surprised at how much they know.
Also, you can go on different websites and find things such as birth and marriage certificates, and war records.
I found out that some of my family had been in the First World War. This was very interesting because I never heard about that part of the family.
Stephanie's great-great-uncle Thomas Keelty and his soldier's service pay book
My great-great-uncle Thomas Keelty MM was injured while fighting in France. He was being taken to hospital by a Red Cross ambulance when it was hit by a bomb.
He died aged 21, just three weeks before the War ended.
Many of our family have been to visit his grave in the war cemetery in Belgium.
Learning about my family history was great. I learned a lot and it was fun. Many thanks to all my family for helping with the research. I appreciate the time and effort they have put in.
Why don't you try to trace your family back through the World Wars?"
Stephanie, 12, Manchester
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