Difference Between Defense And Defence

tl;dr
Defense is used for physical protection and defence is used for intellectual protection.

Defense and defence are two words that are often used interchangeably, but they actually have different meanings. Defense is a noun that is used to refer to the protection of a person, place, or thing. It is typically used in the context of military or physical protection. Defence, on the other hand, is a noun that is used to refer to the protection of an idea or concept. It is typically used in the context of legal or intellectual protection. In summary, defense is used for physical protection and defence is used for intellectual protection.