What is Route Leaking in MPLS/VPN Networks ?

[asd]

Hi Expert,

Please help me out to get answer about what is Route Leaking? as i got this is in Interview Question.

How to Finding and Diagnosing BGP Route Leaks ?
What is a Route Leak?
How to Configure Route Leaking between Global and VRF Routing Table?
VRF Lite Route Leaking ?
RFC 7908 Defines BGP Route Leaks ?
What is a BGP route leak?
Definition and Classification of Route Leaks?
How to BGP Route Leak Protection?