Traditionally, History of world has three main branches as follows,
"Separation of Powers means that the three branches of government are separated.
The three branches are
Separation of Powers helps to make sure people are safe"
The fourth & fifth branches were opposition-branch & Media-branch, both are used inter-changedbly, We also have sixth & seventh branch, which we call, opposite-gender-branch, resident-leadership-branch
Article One, two, three of constitution of united-states of america deals with Legislative, executive, judicial branches of governance respectively, which is popularly used in world today