What is the difference between closed beta and open beta?

Closed beta is a product testing phase where access is limited to a select group of users, usually invited or chosen based on certain criteria. This allows for targeted feedback and the identification of critical bugs in a controlled environment.

Open beta is a broader phase where the product becomes available to a large number of users, often without restrictions. The goal is to test the product in real-world conditions, gather extensive feedback, and prepare the product for public release.

Thus, the main difference lies in the scale of the audience and the level of control over testing.