Solat Tarawih is the extra prayer that is performed during the night on the month of Ramadhan. Although it is not as compulsory as the 5 Compulsary Daily Prayer which takes place during Subuh, Zohor, Asar, Maghrib and Isyak. Tarawih is the plural word of Tarweeha which means to rest.
There are benefits for performing Tarawih:
Narrated by Abu Hurairah, Hadith 226:
“Whoever prayed at night in it (the month of Ramadan) out of sincere Faith and hoping for a reward from Allah, then all his previous sins will be forgiven.”