The phrase "than the public sector" is a comparison between two different sectors, typically referring to the private and public sectors. The public sector refers to organizations or entities that are owned by the government and funded through taxpayer money, such as schools, hospitals, and other social services. In contrast, the private sector refers to businesses or organizations that operate for profit and are not directly controlled by the government.
When the phrase "than the public sector" is used in a sentence, it typically means that something (such as a service, product, or organization) is better or more efficient than what is provided by the public sector. For example, if someone were to say "The private healthcare system is better than the public sector," they would be implying that private health insurance and medical care are generally of higher quality and provide better outcomes than those offered through government-funded programs like Medicare or Medicaid.