Public Private Partnerships involve private companies helping with public infrastructure projects. The government doesn't own the infrastructure but buys services from the private sector. PPPs are about sharing risks to achieve public policy goals. To be successful, projects must allocate risks efficiently. If too much risk is kept by the government, PPPs may not be cost-effective. On the other hand, transferring unnecessary risks can make projects more expensive. Managing risks is crucial for project success and getting value for money.