New to IT field. Would like to learn. Certificates

[myk4030]

Hi guys. i am new to the IT field. I know computer basics but have areas where i have questions. Can somebody explain in a very simple way so a newbie could understand on how certificates work? I know some tokens have certificates and also browser stores certificates as well. i just need to know the inner workings on certificates. thank you.

 

[Evvvvv]

https://www.entrustdatacard.com/pages/ssl
If this is what you're asking

 

[kanewolf]

MERGED QUESTION
Question from myk4030 : "New to IT. Want to learn"

Hi Guys. I am interested in venturing into the IT field. I know computer basics but i have have some areas where i need clarification.

So in a tcp/Ip configuration and when talking about authentication and sending packets to a specific destination. My questions is do both entities need to authenticate every time they communicate/send packets to each other? or do they only need to authenticate one time and can communicate back and forth with each other?