I want to home make popcorn by myself. Watching some video on youtube, I saw they are using a kind of kernel of corn. Are they different to what we eat normal corn? It seems that they are much smaller. 
Ask at your local supermarket for "popping corn", not popcorn. Usually in the snacks section or whole foods section  In Hong Kong try Edens or Little Giant  On the mainland be careful "popping corn" is a pyrotechnic device !  To make popcorn you don't need any special equipment, just a saucepan and a little practise 