Go to www.atr.fr - that is the website of the manufacturer.
The ATR 42 is a french turboprop, and the 72 is a stretched version of it. Fairly popular in Europe, though blown away by the regional jet boom. For a while they joined efforts with Avro to form AIR and produce the Bae146 derivatives and the turboprops under a single brand, but it did not work out.
I guess it's a pretty safe plane (never been in one), but boring because it is a turboprop.
PS: I don't think ATR stands for Aerospatiale, though.