Legal Definition
In a legal context, 'illegal' refers to an act or action that violates established law, statute, or regulation, resulting in penalties or sanctions. It signifies a breach of the codified rules of the jurisdiction under which the legal document operates.
Plain-English Translation
Imagine something is 'illegal' when it breaks the official rules set by the government or courts. It means doing something that is against the law, like breaking a rule about what is allowed or required.