What term best describes a law that is decided based on judicial rulings over time?

The term that best describes a law decided based on judicial rulings over time is common law. Common law emerges from the decisions made by judges in courts, which create legal precedents that guide future cases. This body of law evolves over time as new rulings are made, allowing it to adapt to changing societal values and circumstances.

In contrast, codified law refers to laws that are written down and organized into codes, such as civil or penal codes. Regulatory law involves rules created by governmental agencies to enforce statutory laws, while statutory law consists of laws enacted by a legislative body. These different types of law are created through distinct processes and don't rely on judicial interpretations over time in the same way that common law does.