What I mean with fajr prayer is sunnah prayer before subh prayer. The Prophet ﷺ strongly recommends it. So please try to always doing it!
It was narrated that ‘A’ishah (may Allah blesses her) said:
لَمْ يَكُنْ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَلَى شَيْءٍ مِنْ النَّوَافِلِ أَشَدَّ مِنْهُ تَعَاهُدًا عَلَى رَكْعَتَيْ الْفَجْرِ
❝The Prophet (ﷺ) did not adhere more firmly to any naafil (sunnah) prayer than the two rak’ahs of Fajr.❞ [al-Bukhari and Muslim].
Also, about this prayer, the Prophet (ﷺ) said:
رَكْعَتَا الْفَجْرِ خَيْرٌ مِنْ الدُّنْيَا وَمَا فِيهَا
“The two rak’ahs of Fajr are better than this world and everything in it.” [Muslim].
Before Fajr there is a Sunnah raatibah (routine) prayer (established Sunnah) which is two rak’ahs. This is the most firmly established of the Sunnah raatibah prayers. The Prophet (ﷺ) never failed to offer this prayer, whether he was at home or travelling. [Taken from: islamqa.info]