The Royal British Legion is like a big club for people in Britain who have served in the military (that means they worked for the army, navy, air force or other parts of the armed forces). The club helps these people and their families when they are going through a tough time, like if someone they love was hurt or killed while serving in the military.
The club also works hard to make sure that everyone in Britain remembers the sacrifices that military personnel have made to protect the country. They organize ceremonies and events to help people show their respect and appreciation for the people who served in the military.
The Royal British Legion also helps to raise money to support military families who need extra help. They use the money they raise to provide things like financial assistance, mental health support, and education and employment opportunities for veterans and their families.
So basically, the Royal British Legion is a really important organization in Britain that helps take care of the people who have served in the military and their families, and makes sure that everyone in the country remembers and appreciates their sacrifices.