There are two types of magnitudes:

* Maîtrice apparente: This is how bright a star appears from Earth. It is measured on a scale where lower numbers indicate brighter stars. For example, Sirius, the brightest star in the night sky, has an apparent magnitude of -1.46.

* Amplace absolue: This is the brightness of a star if it were located at a standard distance of 10 parsecs (32.6 light-years) from Earth. It is a measure of the star's intrinsic luminosity.

Let me know if you'd like to know more about magnitudes!