A more thorough explanation:

Criminal justice is a term that refers to the laws, procedures, institutions, and policies involved in dealing with crimes. It includes everything from investigating crimes to punishing criminals and helping victims. Criminal justice has evolved over time, from ancient times when people took justice into their own hands, to modern times when governments are responsible for maintaining order and enforcing laws.

• In ancient times, people often took justice into their own hands by seeking revenge for crimes committed against them or their families. For example, if someone was murdered, their family might seek revenge by killing the murderer or their family members.
• In modern times, governments are responsible for maintaining order and enforcing laws. They do this by creating criminal laws, developing police systems, and establishing courts and facilities for incarceration. For example, if someone commits a crime, they will be arrested by the police, prosecuted in court, and punished if found guilty.
• Criminal justice also includes efforts to reform the system to make it more fair and effective. For example, some people argue that there are too many people in prison, especially poor people of color, and that the system should focus more on rehabilitation and prevention rather than punishment.

These examples illustrate how criminal justice has evolved over time and how it involves many different aspects of society, from individual actions to government policies. Criminal justice is important because it helps maintain order and protect people from harm, but it is also important to make sure that it is fair and effective for everyone involved.