What is the difference between bug release and bug leakage?

Bug release is when a version of the software is released with a set of known bugs. These bugs are usually of low severity/priority. It is done when a software company can afford the existence of a bug in the released software rather than the time/cost for fixing it in that version. Bug leakage is something when the bug is discovered by the end users or customers and missed by the testing team to detect while testing the software.