In British English, you refer to a period of time that you are allowed to spend away from work or school as the holiday or the holidays.
The school had undergone repairs during the holiday.
One day after the Christmas holidays I rang her up.
You refer to a period of time spent away from home enjoying yourself as a holiday.
He thought that Vita needed a holiday.
I went to Marrakesh for a holiday.
When you spend a long period of time like this each year, you refer to it as your holidays.
Where are you going for your holidays?
You usually use a determiner or a possessive in front of holiday or holidays. Don’t say, for example, ‘I went to Marrakesh for holidays.’
If you are on holiday, you are spending a period