conjunction: used to link alternatives, indicating a choice between them
You can have tea or coffee.
conjunction: used to introduce a consequence
Hurry up, or we will be late.
conjunction: used to introduce a threat, often in the form 'or else'
Finish your homework now, or else you won't be allowed to play video games.
conjunction: used to indicate approximation between numbers or quantities
The hike is five or six kilometers.
