The Hanafi text classifies Witr as Wajib.
Its normal structure is:
• 3 rak'ahs;
• one Salaam at the end;
• al-Fatihah plus a Surah or sufficient verses in every rak'ah.
This differs from a four-rak'ah Fard, where the additional Surah is not Wajib in the later rak'ahs.