It is obligatory to perform the following five prayers during day and night:
1- Dawn prayers (Fajr) - 2 Rak'ats.
2- Midday (Zuhr) and Afternoon prayers ('Asr) - each one consisting of 4 Rak'ats.
3- Dusk prayers (Maghrib) - 3 Rak'ats and Night prayers ('Isha) - 4 Rak'ats.