Hello Neharika.Khanna,
First things first, restricted holidays, also termed optional holidays are types of holidays that are optional for employees. It completely depends on an employee if she or he wants to take that specific holiday or not. In addition to this, employees have the right to choose a specific number of optional holidays in a year.
The whole purpose of restricted holidays is to foster cultural pluralism in our country.
Now, it is important to note that not every employer across India gives restricted holidays to their workforce. They are typically given to employees working in the government sector. However, some private organizations also provide such holidays. That means it is up to you.
Furthermore, restricted holidays are not counted with casual leaves.
I hope you got a clear understanding of restricted holidays now.