The significance of protein in muscle building is crucial, as it provides the essential amino acids needed for muscle repair and growth. Proper protein intake stimulates muscle protein synthesis, which helps in recovering from resistance training and encourages muscle hypertrophy. Consuming adequate protein after workouts aids in repairing muscle fibers stressed during exercise, maximizing gains. Additionally, protein supports other physiological functions, such as hormone production and immune health. Remaining aware of protein requirements is vital for anyone looking to build or maintain muscle.