A rigid constitution is a type of constitution that is difficult to amend or change. This means that any alterations require a complex process, often involving a supermajority vote in the legislature or approval by the public through a referendum. The intention behind a rigid constitution is to provide stability and protect fundamental rights from frequent changes. Countries like the United States and Germany have rigid constitutions, which help ensure that core principles remain intact over time. This contrasts with a flexible constitution, which can be modified more easily, allowing for quicker adaptations to changing societal needs.