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 of time away from work or school, or you are spending some time away from home enjoying yourself.
Remember to turn off the gas when you go on holiday.
In American English, a holiday is a single day or group of days when people do not work, often to commemorate an important event.
In British English, a day like this is called a bank holiday or a public holiday.
When Americans talk about the holidays, they mean the period at the end of the year that includes Christmas and the New Year; sometimes Thanksgiving (at the end of November) is also included in this.
Now that the holidays are over, we should take down our Christmas tree.
The usual American word for a longer period of time spent away from work or school, or for a period of time spent away from home enjoying yourself, is vacation.
Harold used to take a vacation at that time.