How Can I plug a TV cable into a MacBook?

I work for a school district and they plug there cable into there Mac computers so they can watch TV. What would I need to buy to be able to plug a TV cable into my MacBook. Would I also need to buy a program to use on my MacBook to be able to view the cable? If I need to buy a program what would I need to buy or could I get a free program to use on my MacBook.
 
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