What do you mean by data encapsulation?

[beingchinmay]

Data encapsulation is a concept of binding data and code in single unit called object and hiding all the implementation details of a class from the user. It prevents unauthorized access of data and restricts the user to use the necessary data only.

[LyzLauren]

Try reading this content, hoping it can help

http://www.cs.mun.ca/~donald/bsc/node13.html

[Lishmalinyjames]

The data is de-encapsulated at the same layer at the receiver's end to the encapsulated layer at the sender's end. The added header and trailer information are removed from the data in this process.