No. tarawih is not fard. It is Nafal which means that it is purely optional.

Yes,

they pray tarawih. refer to question below for more information.

Only during the last ten days of Ramadan.

Tarawih prayers are special prayers performed by Muslims during the Islamic month of Ramadan. They are optional prayers that are usually performed in congregation at night after the obligatory night prayer (Isha). The Tarawih prayers consist of a series of units of prayer known as rak'ahs, and are meant to seek spiritual rewards and blessings during the holy month of fasting.

Fasting, Tarawih, reproduce charity, reading the Qur'an, Prayer Night.