What is difference between struct and class?

[Rnd]

On Monday, 3 June 2019 at 06:01:15 UTC, Jonathan M Davis wrote:
> On Sunday, June 2, 2019 9:40:43 PM MDT Rnd via 
> Digitalmars-d-learn wrote:
>> On Monday,
> http://ddili.org/ders/d.en/index.html
>
> If you want to know more about structs and classes 
> specifically, then you can go straight to the sections on them, 
> but you're going to understand a lot of things better if you 
> just read through the book.
>
> - Jonathan M Davis

I know 'new' is not needed to create instances of structs but can 
one use 'new'?

If yes, when should one use 'new'?