Everyone knows when Christmas is coming. The shops are full of people buying presents; streets and homes are decorated with Christmas trees and lights.
But Christians never forget what, for them, is the real meaning of Christmas.
Christmas is special because that's when Jesus was born.
The four weeks before Christmas Day are called Advent, which means 'coming'. Advent is a time when Christians look forward to the birth of Jesus and think about what this means.
These special Advent candles are at St James's Church, Hampton. One candle is lit each Sunday. The white candle in the middle represents Jesus and is lit on Christmas Day.
Opening the windows of an Advent calendar is another way to show that Christmas is coming. Each day a new picture until the last one: baby Jesus, born in a stable.
The Bible tells the story of this special event.
One day, a woman called Mary was visited by an angel. The angel told Mary she would have a baby who would be very special: the Son of God.
Mary and her husband Joseph had to travel to a town called Bethlehem, but the only place they could find to stay was in a stable.
That night the baby Jesus was born.
Angels appeared to the shepherds as they were looking after their sheep. They told the shepherds to come to the stable to worship the baby Jesus.
Meanwhile, wise men arrived from the East. They had been following a bright star in the sky. They believed it meant that a new king had been born.
Nativity scenes are an important part of Christmas decorations. They show the scene in the stable where Jesus was born. The wise men are carrying gifts of gold, frankincense and myrrh, and the baby Jesus is lying asleep in the manger.
Girl:
"The meaning of Christmas, I think, is like celebrating the love of Christ and when he came down to Earth."
Boy:
"It's a time of giving and it should be a time of great happiness and thankfulness."
On Christmas Eve many Christians go to a special church service called Midnight Mass. Services are also held on Christmas morning.
But Christmas Day is also a time when families and friends gather round to celebrate – like the Smart family from Sutton in south London.
After the meal, everyone gathers round the tree to open presents. The idea of giving presents comes from the Christian belief that Jesus was God's gift to the world.
Young girl:
"What I like about Christmas is... Well, as well as getting presents, I also like [...] giving presents – see other people... how they feel about it, and if they're happy with what they got and stuff."
For many Christians, the real meaning of Christmas is about giving to others. Jesus spent much of his life helping people in need.
Clergyman:
"Christmas Day is one that everybody looks forward to, I suppose. And Christians believe that on Christmas Day Jesus was born in Bethlehem – but born into our hearts and lives every day. So it's not just looking back; it's about every day being a day when we can make real in our lives what Jesus does for us."