A product cyber security lifecycle is a set of processes and practices that are followed to ensure the security of a product throughout its lifecycle, from development to retirement. The goal of a product cyber security lifecycle is to identify and address potential security vulnerabilities in a product before it is deployed, and to ensure that the product remains secure throughout its use.

There are several stages in a product cyber security lifecycle, including:

1. Planning: During the planning stage, the product’s security requirements are defined and a plan for meeting theserequirements is developed.
   
   

2. Development: During the development stage, the product is designed and built with security in mind. This includes implementing security controls and testing the product for vulnerabilities.
   
   

3. Deployment: During the deployment stage, the product is rolled out to users and the necessary security controls and processes are put in place to ensure its security.
   
   

4. Maintenance: During the maintenance stage, the product is regularly monitored for security vulnerabilities and patches are applied as needed to address any issues that are discovered.
   
   

5. Retirement: During the retirement stage, the product is decommissioned and any data associated with it is securely erased to ensure that it cannot be accessed by unauthorized parties.

Following a product cyber security lifecycle helps to ensure that a product is secure throughout its lifecycle and minimizes the risk of security breaches and other vulnerabilities.