MS CRM Plugins- When to use Entity/EntityReference

For create and Update we use Entity and for Delete it is EntityReference for checking Target.

For other messages we have to use mostly Entity but we need to think where to use EntityReference. For Associate/Disassociate we have to use EntityReference as well. 

Now the Question is What is Target ? Is it all the time used or is any other Properties are available ?

Ans :- Target is a properties for MessageRequest. it is not same for all type of messages.

 For Assign if you have write code , then you can check

For Assign if you have write code , then you can check