Beamer: Emphasize a part of a slide

Question

I am using Beamer to create presentations. I know that it is possible to use environments like Theorem, Definition and so on:

\begin{Teorem}
Great theorem
\end{Theorem}

It appears in the box of different color with its header "Theorem".

I would like to create the same emphasized box, but without any header. How one can do this?

Answer 1

It actually depends on the style used, but you can also use the block, alertblock and exampleblock environments to get blocked off text.

Answer 2

The Beamer User Guide (PDF) has some explanations beginning on page 111. Usually you can just write:

\begin{theorem}
   a^2+b^2=c^2
\end{theorem}