In criminal law, a conspiracy is an agreement between two or more people to commit a crime at some time in the future. Criminal law in some countries or for some conspiracies may require that at least one overt act be undertaken in furtherance of that agreement to constitute an offense. There is no limit to the number participating in the conspiracy, and in most countries the plan itself is the crime, so there is no requirement that any steps have been taken to put the plan into effect.