Here are what people typically use MyFitnessPal for:

Feature What it does

Food logging / Calorie counting You can search from a huge database of foods, scan bar-codes, or manually input meals. Helps you see how many calories you’re eating.
Macro tracking Not just calories — track carbs, fat, protein; set goals for macros.
Exercise & Activity log Log your workouts and physical activity to see how much you’ve burned.
Water tracking Track daily water intake.
Integration Syncs with wearables &