Australia Day is on 26th January.
It marks when the British came in 1788.
People celebrate with barbecues in backyards.
Families and friends gather to eat sausages and have fun.
There are also community events like fireworks and concerts.
New Australians can join citizenship ceremonies to become part of the country.
Many people talk about the meaning of this day, which can be hard for Aboriginal and Torres Strait Islander peoples.
It is important to think about what it means to be Australian today.