Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The execution was practised in public places. The "public spectacle" character of the execution was meant to deter the people from committing crimes, and demonstrate the authority of the Government, while simultaneously acting as a form of entertainment for the masses. For this purpose, the scaffold was often higher than a podium setup, and was therefore also called scaffold.