How kaspersky uses its self-sign certificate in TLS/Handshake to Scan the Secure Traffic?

[iedco.cybertech]

Hi 

I have readen thi Linux course of Kaspersky Endpoint Security and reached to the topic that was about "how kasperksy scan encrypted traffic?" and A question has arisen for me that how Kaspersky's Self-sign certificate participate in TLS/Handshake proccesses?How does it spoofed it self ?what contents does it have? 

I konw that it uses Man In The Middle to sacn the traffic but I have confused what role takes on the self-sign certificate in the whole proccess.