Tefal steam generators are equipped with a variable steam dial which allows you to regulate the amount of steam you use while ironing. This function, in conjunction with the soleplate temperature setting, allows you to obtain the appropriate ironing settings for all of your garments. Having variable temperature settings for your iron is important, as most fabrics have different ideal temperatures at which they should be ironed for optimal results (so creases do not re-appear once the fabric has fully dried).
Similarly, depending on the thickness of the fabric, various steam settings ensure you find the ideal one for every item in your ironing pile. Cotton and silk are two common examples of different fabrics which need to be ironed at very different temperatures and different steam outputs for better looking results.
In short, the most efficient temperature and steam output for each fabric provides safer, faster and higher quality ironing.