What does the 'ECO' button do on my Vauxhall Corsa?

I noticed a button with 'ECO' written on it in my Vauxhall Corsa. Can you explain what it does and if I should be using it?

The ECO button is designed to improve fuel efficiency and reduce emissions by adjusting the car's performance. It is recommended to use it when driving in city traffic or on long journeys.

The ECO button may also affect the air conditioning and heater settings, so keep that in mind while using it. It is not recommended to use it when driving on highways or in sporty driving conditions.

I have found that using the ECO button helps in reducing my fuel expenses significantly. It also helps in reducing the wear and tear of the engine. Overall, I highly recommend using it.