Basic LaTex document classes

Document Class Name Usage/meaning
 article for articles in scientific journals, presentations, short reports, pro-
gram documentation, invitations, . . .
 proc  a class for proceedings based on the article class.
 minimal is as small as it can get. It only sets a page size and a base font. It
is mainly used for debugging purposes.
 report  for longer reports containing several chapters, small books, PhD
theses, . . .
 book  for real books
 slides   for slides. The class uses big sans serif letters. You might want to
consider using the Beamer class instead.