What does "freeze" mean in Debian?

[Hans <hans.ullrich@loop.de>]

Hi folks, 

just a little thing, I am somehow confused about.

I read that debian/testing is now in state "freeze" as the next release is 
shortly to come.

As I running "bookworm" now, I am wondering, that debian/testing (aka 
bookworm), still gets a lot of changed packages last days. 

Obviously I seem to misunderstand the meaning of "freeze". 

Does "freeze" mean "No new packages" od does it mean "actual packages in 
testing will not be changed any more till next release". 

What did I not understand? For me "freeze" means "stay at actual status and do 
only necessary changes for security or breaking reasons".

There are almost a hundered packages I got untill "freeze" and my change to 
bookworm (aka testing).