The fundamental characteristics of a law are its objectivity and universality, stability and scientificity, and necessity.

1, objectivity and universality: the law is objective, does not depend on human consciousness, activity and independent existence. People can not create, change or eliminate the law at will, can only recognize, use and follow the law.

Laws have universal applicability in similar things. It is not for specific things or phenomena, but applies to a wide range of similar things or phenomena. For example, the laws of nature, social laws, economic laws, etc. are universal.

2, stability and scientific: laws can be repeated under certain conditions, with relative stability. In the same or similar conditions, the law will repeat and produce the same or similar results. Laws can be scientifically studied and recognized. People can discover, recognize and verify the laws through observation, experiment, reasoning and other methods, and use the laws to guide practice and life.

3, inevitability: law is the embodiment of inevitability, the development and change of things must follow certain laws. Laws are inevitable, whether or not people realize or willing to accept, the law will play a role and have a corresponding impact.

Advantages of laws:

1, guidance: the law is instructive, it can help us better understand and grasp the nature and laws of things, guide our actions and decisions.

In the field of science, the laws are summarized by scientists through a large number of experiments and observations, which provides an important reference framework for us to understand the world. In daily life, laws are also instructive, such as traffic rules, work rules and so on, they can guide us to better adapt to society and life.

2, predictive: laws are predictive, it can help us to predict and deduce the possible future situation. This is because the law is often presented in a large amount of data and phenomena, which reveals the internal mechanism and inevitable trend of the development of things, so we can make certain predictions and inferences about the future through the understanding and application of the law.

3, scientific: the law is scientific, it is summarized on the basis of a large number of experiments and observations, it has been rigorously verified and tested in practice, so it has a high degree of scientificity and reliability. The discovery and summarization of laws is the result of scientists' continuous efforts and exploration, which provides an important foundation and support for scientific research.