Super Saiyan Level 1
This is first powered up level of a saiyan. In this form their muscles bulge out more than usual, their hair turns bright yellow, and their eyes turn green. The first transformation must be caused be extreme anger. Saiyans reach this form when their power level is over 100,000.
Ultra Super Saiyan
Form of supersaiyan level 1, that is slightly more powerful, and causes muscles to bulge out even further. Trunks and Vegeta treansform into this stage.
Super Saiyan Level 2
This is the next level of super saiyan. It is a lot more stronger than the first. In this level, the super saiyan's yellow hair gets longer, and their muscles get even larger.
Super Saiyan Level 3
This level of super saiyan has an immense source of powers. Again, the muscles bulge larger, the long yellow hair extends down to your feet, and you lose your eyebrows.
Super Saiyan Level 4
This form can be seen only in Dragonball GT. In this form, you have long hair, but keep your hair color, grow fur across your body,have weird pants, and have a tail like an oozaru. An oozaru is a form of of a saiyan with a tail, and when they see a full moon, they get ten times stronger and have fur.
SS 4 Golden Oozaru
This form is an even higher form of SS4, but is also considered a whole other form. A golden oozaru is like the
oozaru form, but is much stronger and takes on a golden like color. Goku manages to reach this state.