Is it necessary to have a panini maker in order to make a panini? explain why or why not. how can it done?

No, you can use a pan lid for a press. This works best if you cook your panini for a few minutes on each side while pressing down on the lid. Or you could also use a pot. If you have a large spaghetti or soup pot, you can put some rocks inside and press your panini with it. 

You do not really need a panini maker in order to make a panini. Grills work just as well!
Hope this helps and please give brainliest!