Short answer
A WebRTC leak means the browser may reveal local or public network addresses through WebRTC features.
What WebRTC is used for
WebRTC is used for video calls, voice, screen sharing and direct communication in the browser without extra plugins.
Why leaks can happen
To create direct connections, WebRTC needs to discover possible network paths. This can expose certain addresses to website scripts.
How to reduce the risk
Keep the browser updated, use a VPN with WebRTC protection, check browser settings and use extensions carefully because they can also affect privacy.
Common questions
Should I disable WebRTC?
Only if you need higher privacy and do not use web-based calls that require WebRTC.
Does WebRTC affect all browsers?
Most modern browsers support WebRTC, but behavior and settings vary.