Defense means to prevent or to protect against danger. This is often physical harm, but one could be defended against social or emotional harm, as well. In the magical world, defense could be used to stop a hex or a jinx from harming yourself or another person. One could also defend themselves from dark wizards or dangerous magical creatures. Defense is also an important part of magical duels. Defense is a highly important skill for one to learn, so you can be able to protect yourself and those you love from potential harm.