What is the purpose of the BMW 1 Series sport mode?

I recently purchased a BMW 1 Series and noticed a 'sport mode' button on the dashboard. What does it do and when should I use it?

Switching to sport mode increases the car's engine responsiveness and allows for quicker gear changes, enhancing the overall driving experience. It's especially useful when driving on steep inclines or when overtaking other vehicles.

Sport mode is designed for more spirited driving, giving the car a more aggressive feel. If you're someone who enjoys driving faster and pushing the limits of your car, then sport mode is definitely for you.

I find using sport mode on long drives helps to prevent my legs from getting tired. The extended engine revs and sharper gear changes keep you alert and engaged throughout the journey.