Unique holiday: make a single holiday. For example, selecting August 1, 2012 will make it a holiday, but will not affect August 1 in other years.
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Weekly holiday: make this weekday a holiday, every week. For example, if your library is closed on Saturdays, use this option to make every Saturday a holiday.
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Repeatable holiday: this will take this day and month as a reference to make it a holiday. Through this option, you can repeat this rule for every year. For example, selecting August 1 will make August 1 a holiday every year.
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Floating holiday: this will take this day and month as a reference to make it a floating holiday. Through this option, you can add a holiday that repeats every year but not necessarily on the exact same day. On subsequent years the date will need validation.
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Need validation: this holiday has been added automatically, but needs to be validated.