Three-valued logic

Three-valued logic is like if/then statements or rules, but there can be three different outcomes instead of just two. A three-valued logic statement can be true, false, or something in between. For example, maybe there is a rule that says, "If you want to go to the store, you must wear shoes". So if you didn't wear shoes, the statement is "false" because you didn't follow the rule. If you did wear shoes, the statement is "true" because you followed the rule. But what if you only wore one shoe? That's not following the rule, but it also isn't not following the rule. That's when it is "in between", or "maybe" in this example.