What is TOSHAKHANA Reference case against Imran Khan?

WHAT IS TOSHAKHANA REFERENCE CASE? | Cases against Imran Khan and Nawaz Sharif explained
https://youtu.be/Bo40rts7aDM
CONTENT
1-INTRO 00:00
2-TOSHAKHANA KYA HAI 00:50
3- IMRAN KHAN TOSHAKHANA CASE EXPLAINED 03:23
4- NAWAZ SHARIF, ZARDARI CASE EXPLAINED 04:53
5- WHAT'S WRONG WITH TOSHAKHANA 05:46