As a professional product manager, my favorite video calling product is Zoom. I think it is one of the most user-friendly and reliable video conferencing tools available on the market today. When defining success metrics and goals for a video calling product, there are several key factors to consider. First and foremost, it is important to ensure that the product delivers a high-quality video and audio experience. This can be measured through metrics such as call quality, latency, and dropped calls. Another important factor to consider is user engagement. A successful video calling product should encourage users to stay engaged and present during calls. Metrics such as time spent on calls and repeat usage can provide insights into user engagement. Finally, it is important to consider the business impact of the product. This can be measured through metrics such as customer acquisition, revenue, and customer retention. A successful video calling product should not only meet the needs of its users but also generate value for the company. In summary, a successful video calling product should deliver high-quality video and audio, promote user engagement, and generate business impact.