The Roman Forum
Here is a basic glossary entry on the Forum Romanum, the center of Roman life, that was located in the area between the Palatine and Capitoline, wjere it was surrounded by temples and public buildings. For more details, see Profile of the Forum, Pictures of the Roman Forum, and a list of the forums in Rome: the Roman Fora.
Roman Forum - Reconstructed
A reconstructed image of the Roman Forum with information on many of the buildings in it.
Forum of Nerva
Glossary entry on the forum of Nerva or "forum Nervae".
Trajan's Markets in Rome
The markets in Trajan's forum have been compared with a shopping mall.
Profile of the Roman Forum
There is a bit more detail here on the Roman Forum: the Roman forum or Forum Romanum, by the Capitoline Hill, was the center of life in ancient Rome.