\begin{frame}[label=labelname]
\frametitle{text_of_title}
text
\end{frame}

- a frame is a basic unit of the presentation. 
- a slide is whatever is visible at a given moment. Thus the given frame 
  can consist of several slides. (However, a viewer wouldn't tend to call it that way.)
- "text_of_title" is the title of the given frame
- within the frame things can change dynamically; these changes are what distinguishes
  individual slides of the frame
- text = whatever is to be shown within the frame, including commands for appearance
  and dynamical changes
- "labelname" is the reference name for the given frame 


\frame{text}

- a short version