Why the sun is brighter than the moon?

The sun releases energy from a fusion reaction; the energy is radiating away in zillions of photons per second. The moon is actually quite dark - it's albedo is only about 7% - and, what we see is reflected sunlight... No matter what object we look at in the solar system - if it's reflecting the sun's light, the amount of light we see from it will be a subset of the light coming from the sun - always less than the sun.

The Sun is the primary source of light in the Solar system. The Moon only reflects a little of that light.

because the sun is a whole bunch of stars burning at a ridiculously high temperature and the moon is literally like a giant floating rock which would be completely dark if the sun didnt light it. the only reason we can see the moon is because the sun is shining on it (i am not expert, dont know the proper terms for everything but thats the main jist of it)

Sun radiates while Moon only reflects what it receives from Sun. A huge fire reflected in a mirror doesn't scorch anybody.

The Sun is in the daytime and the Moon is in the night time.

The sun is a single star that burns brightly and gives all of our light source (except for the light we see from stars, galaxies and nebulae). Remember that we only see non luminescent objects from their reflected light, which scientifically is known as the objects "Albedo".

See the Wiki reference for a comprehensive explanation.

One is a small lumpy rock. One is a giant nuclear reactor of 27,000,000 degrees Fahrenheit.

the sun is on fire , the moon is not