"Illegal" refers to actions or behaviors that are not permitted by law. These laws are established by governments to maintain order and protect citizens. When something is deemed illegal, it can lead to penalties such as fines, imprisonment, or other legal consequences. Examples of illegal activities include theft, drug trafficking, and vandalism. Each country has its own set of laws, so what is illegal in one place may be legal in another. Understanding the concept of legality is important for individuals to navigate their rights and responsibilities within society.