Some of them are religious, and in the UK they are sometimes referred to as "collective worship".
According to a survey by the BBC, a third of state school children in England don't attend a daily act of worship.
UK law says that children should attend a daily act of worship that is 'broadly Christian' everyday.
However some schools decided not to give their assemblies a Christian theme.
The head of Woodside High School in London, Joan McVittie told the BBC that the theme is irrelevant given the multicultural nature of the school.
Independent schools and those with a religious character can agree their own rules as they are exempt from the law.
We also hear a different opinion from the Bishop of Oxford, John Pritchard, who agrees that we must not exclude some of students by practising the broadly Christian theme but he urges teachers to hold together the Christian heart whilst teaching a broader religious framework.
He thinks that Christianity is the essence of British culture and history.
Should daily collective worship for any religion be compulsory everyday? Should religion be left to be taught outside school? We would like to hear your views
