Rosh HaShanah (ראש השנה) is the Jewish New Year. It falls once a year during the month of Tishrei and occurs ten days before Yom Kippur. Together, Rosh HaShanah and Yom Kippur are known as the Yamim Nora’im, which means the Days of Awe in Hebrew. In English they are often referred to as the High Holy Days.
source: picture: http://www.timeanddate.com/holidays/us/rosh-hashana
source: definition: http://judaism.about.com/od/holidays/a/roshhashanah.htm