Strength training aims to increase how much force your muscles can produce. Workouts typically use heavier loads with fewer repetitions (often about 3–6 per set) and longer rest between sets, so you can keep lifting near your maximum with good form.
Hypertrophy training aims to increase muscle size. It usually uses moderate loads with higher reps (often about 6–12 per set) and shorter rests, emphasizing training volume and muscle fatigue so muscle protein synthesis outpaces breakdown over time.
Both are forms of resistance training and often overlap. Many programs combine heavy compound lifts for strength with moderate-rep work for muscle growth. Choose the emphasis that matches your goal—max force versus muscle size—or mix both.
Source: Strength training vs hypertrophy: the key differences — Women’s Health UK