What is the difference between sessions synchronously and asynchronously?

I'm using the MATLAB API C++ to run some commands from MATLAB on my c++ project.

My question: what is the difference between sessions synchronously and asynchronously?

matlab::engine::connectMATLAB
matlab::engine::connectMATLABAsync

Thank you.

[BNB]

I found the following explanation here

" Synchronous Versus Asynchronous Operations

The VISA object can operate in either synchronous or asynchronous mode. In synchronous mode, the MATLAB command line is blocked until

• The read or write operation completes
• A timeout occurs as specified by the Timeout property

In asynchronous mode, control is immediately returned to the MATLAB command line. Additionally, you can use callback properties and callback functions to perform tasks as data is being written or read. For example, you can create a callback function that notifies you when the read or write operation has finished."