Testing in production is an evolving software development practice that allows companies to validate and verify applications in live environments after their release, involving stakeholders such as developers, designers, and end users. The practice is driven by the complexity of modern testing environments and the limitations faced by testing teams in terms of time, budget, and specialized resources. Testing in production offers realistic testing opportunities, enhances application visibility, and supports continuous development. Despite its benefits, it poses challenges such as security risks, the need for advanced deployment skills, and potential disruptions to production environments. To mitigate risks, techniques like feature flags are used, enabling functionalities to be toggled on or off without redeployment. This approach is increasingly essential in a cloud-based, agile, and DevOps-driven landscape, offering valuable insights into real-world application performance and user interaction. However, it demands careful implementation to avoid negative impacts on product quality, user trust, and brand reputation.