Muhammad Junaid Zafar; Malaika Sarfaraz Khan; Qura-Tul-Ain Sajjad; Robina Shakil. A COMPARATIVE ANALYSIS OF DUOLINGO AND BABBEL IN ENHANCING UNDERGRADUATE STUDENTS’ LANGUAGE COMPREHENSION: A USES AND GRATIFICATIONS THEORY PERSPECTIVE. IPJLL 2026, 4 (3 (s2), 540-554.