No, the brightness is what allows you to see it. The ones that are impossible to see don't have enough brightness.
See related question
Apparent magnitude
That refers to its actual brightness, not to how we see it. The apparent brightness depends on the real ("absolute") brightness, but also on the distance.
They are related because the bigger the star the brighter u can see it otherwise the smaller the star the duller it is to see.
Sometimes the brightness of the light from the moon drowns out the star's light.
The brightness of a star depends on the star's temperature, size, and distance from Earth.Distance on which you can see the stars.
Venus is the brightest star. It is also the hottest planet it reflects a lot of light from the sun and we can see it as a bright dot in the sky.
Your place on the earth, The brightness of the star, Its distance.
Absolute magnitude and apparent magnitude are the same because they are both ways on how to measure the brightness of a star. Absolute magnitude is how bright is the star if we will see it in a 32.616 light-years distance while apparent magnitude is the brightness of it that we see on Earth.
well as you can see the star is a hot burning thing that shines. it shines for billions of years. the stars temperature is to hot.
As the question specifies brightness, the brightest star in the Universe is our Sun - because it is the closest star to us. The most luminous star is another question: See related question.
That's still uncertain, but of those stars which has been discovered, it's the "Eta Carina Star" which has the brightness of 4,7 million suns (sun = the star u see in the sky in the middle of the day).