Salat-ul-Musafir allows travelers who are more than 77 km from home to shorten their prayers from 4 raka'at to 2 raka'at for Thuhr, Asr, and Isya prayers, making prayers easier. It also allows joining of prayers, where travelers can pray Thuhr and Asr together, and Maghrib and Isya together. Fajr, Maghrib, and the joined prayers cannot be shortened. Salat-ul-Musafir is a way Allah has made practicing religion easier for travelers.