Ashurah

The following article discribes the difference between Sunni and Shia concerning Ashura.

The Day of Āshūr�?h, sometimes spelled Aashurah, �?Ashurah or Aashoorah (Arabic عاش�?راء, ʿĀšūr�?ʾ), is on the 10th day of Muharram in the Islamic calendar and marks the climax of the Festival of Muharram but not the Islamic month. It commemorates the martyrdom of Husayn ibn Ali, the grandson of Muhammad at the Battle of Karbala in the year 61 AH (AD 680). It is a day for mourning.
Ashurah is also commemorated by Muslims as the traditional date on which Noah's ark came to rest, the Prophet Ibrahim (Abraham) was born and the Ka'ba was built in Mecca. Ashurah corresponds to the Jewish Yom Kippur, which was held by the Jews of Medina. It was adopted by Muslims as a recommended fast in respect to the tribulations of Musa (Moses).
The word ashurah means simply tenth in Arabic; hence the festival's name, literally translated, means "the tenth day".

Sunni commemoration
Sunnis also commemorate Ashurah, but for different reasons. According to Sunni tradition, when the Prophet led his followers to Medina, he found the Jews of that area fasting on the day of Ashurah in rememberance of Moses. Today, Sunnis regard fasting on the 10th of Muharram as a recommended, though not obligatory, act. The day carries considerably less significance for Sunnis than it does for Shi'as.
While Sunnis generally consider the martyrdom of Husayn to be an unfortunate event and one of great historical importance, they do not ascribe religious significance to it as the Shi'a do. Hence, Sunni practices commemorating Ashurah generally do not involve Husayn or his death and consist mainly of fasting and prayers.

I'm Sunni and respect the Shia belives and even Jews and christian because my religion does.

This article is from Wikipedia